Life-Saving Appliances · 46 CFR Part 160

Life-Saving Appliances Study Guide

Complete LSA reference for the USCG OUPV and Master license exam. PFDs, immersion suits, liferafts, EPIRBs, SARTs, pyrotechnics, abandonment procedures, and 46 CFR inspection requirements.

70% required— LSA is tested across multiple exam sections
High-frequency topics:EPIRB types, PFD buoyancy, immersion suit donning time

LSA Categories at a Glance

Personal Flotation
Type I–V PFDs, Immersion Suits
Rescue Craft
Liferafts, Rescue Boats, Workboats
Electronic Signaling
EPIRBs, SARTs, AIS-SARTs, PLBs
Visual Signals
Flares, Smoke, Parachute Rockets
Line Throwing
Lyle Gun, Rocket Line Thrower
Regulatory Framework
46 CFR 160, SOLAS Ch. III

Personal Flotation Devices (PFDs)

All USCG-approved PFDs bear the Coast Guard approval number on the label. Approval is based on buoyancy, materials, and construction standards under 46 CFR Part 160. Each vessel must carry one wearable PFD for each person aboard, plus one Type IV throwable device on vessels 16 feet or longer.

TypeNameBuoyancy
Type IOffshore Life Preserver22 lbs (adult)
Type IINear-Shore Buoyant Vest15.5 lbs (adult)
Type IIIFlotation Aid15.5 lbs (adult)
Type IVThrowable Device16.5 lbs (ring buoy)
Type VSpecial Use DeviceVaries by approval

PFD Buoyancy Numbers to Memorize

  • Type I adult: 22 lbs minimum buoyancy
  • Type I child: 11 lbs minimum buoyancy
  • Type II / III adult: 15.5 lbs minimum
  • Type IV ring buoy: 16.5 lbs minimum
  • Type IV cushion: 18 lbs minimum

USCG Carriage Requirements

  • All vessels: One wearable PFD per person
  • 16 ft or longer: Plus one Type IV throwable
  • Children under 13: Must wear PFD underway on recreational vessels
  • Type V: Must be worn to count as required equipment
  • Inflatable PFDs: Not approved for persons under 16

Inflatable PFDs — Special Considerations

Automatic vs. Manual

Automatic inflatable PFDs inflate when submerged (water-sensing bobbin dissolves). Manual inflatable PFDs require the wearer to pull a lanyard. Combination units do both. Automatic inflatables are approved as Type I, II, or III equivalents when properly armed and worn.

Maintenance Requirements

Inflatable PFDs must be inspected before each use: confirm the CO2 cylinder is not punctured, is fully threaded, and is the correct weight. The automatic bobbin must be within its service date. Oral inflation tube must be clear. Re-arm kits are required after each inflation.

Immersion Suits (Gumby Suits)

Immersion suits — commonly called 'Gumby suits' after the rubbery cartoon character — are full-body thermal protective suits required on commercial vessels operating in cold waters. They are regulated under 46 CFR 160.171 and SOLAS Chapter III.

1 min
Donning Time Requirement
Must be donned without assistance in 1 minute or less (46 CFR 160.171)
2°C max
Body Temp Drop Limit
Core temp must not drop more than 2°C in 6 hours in 0°C water (SOLAS standard)
Annual
Inspection Interval
Required inspection at approved service facility; check for tears, valve function, zipper integrity

Immersion Suit Key Requirements

  • Carriage: One per person on inspected vessels in cold-water routes
  • Sizing: Must be sized to the individual wearer; universal-fit suits must accommodate persons from 5th to 95th percentile
  • Buoyancy: Must support 20 kg (44 lbs) of iron in fresh water
  • Visibility: Must be international orange color; retroreflective tape on hood, wrists, and chest
  • Flotation position: Must turn an unconscious wearer face-up within 5 seconds
  • Swimming: Wearer must be able to swim 25 meters and board a survival craft
  • Gloves: Integrated or attached gloves required; must allow basic hand function
  • Whistle and light: Must have integral whistle; SOLAS suits require integrated light
Exam tip: The 1-minute donning time is the single most-tested immersion suit fact. Practice donning drills are required for crew on inspected vessels — not just instruction, actual timed practice. Suits stored in sealed bags must be inspected when removed.

Liferafts

Liferafts are the primary survival craft when a vessel must be abandoned. Inflatable liferafts are packed in a fiberglass canister and stored in a cradle on deck. They are inflated by CO2 when the painter line is pulled or when a hydrostatic release mechanism activates.

SOLAS vs. Coastal Service Liferafts

FeatureSOLASUSCG Coastal
StandardSOLAS (Safety of Life at Sea) — internationalUSCG Coastal Service — domestic
Required watersVessels on ocean and international routesVessels within 20 nm of shore (coastal routes)
Equipment packFull SOLAS A or B pack: water, food, first aid, fishing kit, signaling equipmentReduced pack — fewer rations, basic signals
Buoyancy tubesDouble tube (main + secondary) — no single point of failureMay be single tube
CanopyRequired — double-arch thermal insulating canopyRequired
Capacity markingMust not exceed rated capacityMust not exceed rated capacity

Hydrostatic Release Unit (HRU)

  • Automatically releases the liferaft canister when the vessel sinks to approximately 4 meters depth
  • Water pressure activates a knife that cuts the lashing, freeing the raft
  • The painter line inflates the raft and then has a weak link so it breaks free as the vessel sinks further
  • Service interval: every 2 years at an approved facility
  • Must bear an approval mark and service date label

Annual Canister Service

  • Inflatable liferaft canisters must be inspected annually at a USCG-approved service facility
  • Service includes: repacking, CO2 cylinder weight check, inflation test, equipment pack inventory
  • Service date appears on label attached to canister
  • An overdue service label voids USCG compliance — vessel may be out of compliance even if the raft appears intact
  • Some manufacturers allow 30-month service intervals on approved models

Painter Line and Weak Link

The painter line is the cord that connects the liferaft canister to the vessel. When the raft is thrown overboard, the painter line remains attached to a strong point on the vessel. Pulling the painter (usually about 25 meters of line) activates the CO2 inflation system. At the vessel attachment end, a weak link (break strength approximately 2.2 kN) allows the painter to snap free if the sinking vessel pulls the raft under — the raft floats to the surface rather than being dragged down.

Critical: Always secure the painter to the vessel before throwing the canister. A liferaft launched without a secured painter will drift away uninflated. Confirm attachment before deployment.

Boarding the Liferaft

From the Vessel (Preferred)

If time allows, step or climb directly from the vessel into the raft. This avoids cold-water immersion and reduces the risk of injury. The raft should be alongside and fenders or a boarding ladder used to control position.

From the Water

The raft has a boarding ladder on the side. Enter the water feet first away from the vessel, then swim to the raft. Once at the boarding ladder, kick to a horizontal position and haul yourself up — do not try to climb vertically. A person already in the raft can assist.

EPIRBs — Emergency Position Indicating Radio Beacons

EPIRBs initiate a distress alert via satellite, allowing SAR authorities to identify the vessel and position within minutes. Modern 406 MHz EPIRBs encode the vessel's MMSI or registration number, so USCG can pull vessel information from the NOAA registry immediately — which is why registration is mandatory.

FeatureCategory ICategory II
Frequency406 MHz (digital) + 121.5 MHz homing406 MHz (digital) + 121.5 MHz homing
ActivationAutomatic (hydrostatic release) OR manualManual only
MountingBracket with hydrostatic release unit (HRU)Bracket — must be manually deployed
Satellite systemCOSPAS-SARSAT (LEO + GEO)COSPAS-SARSAT (LEO + GEO)
RegistrationRequired — NOAA registryRequired — NOAA registry
Battery expiryMust replace before expiry date shown on labelMust replace before expiry date shown on label
Self-testBuilt-in self-test; do NOT activate on non-test modeBuilt-in self-test

COSPAS-SARSAT System

  • LEO satellites: Low Earth Orbit; provide near-real-time detection with position accuracy within 5 km (Doppler) or 100 m (GPS-encoded)
  • GEO satellites: Geostationary; provide near-instant detection but no Doppler position without GPS encoding
  • MEOSAR: Medium Earth Orbit — newest generation, near-instant detection AND accurate positioning globally
  • 121.5 MHz: Secondary homing signal only — no longer used for satellite alerting as of 2009

EPIRB Registration — NOAA

  • All 406 MHz EPIRBs must be registered at beaconregistration.noaa.gov
  • Registration links the 15-digit HEX ID to vessel information, owner contact, and emergency contacts
  • Update registration if vessel is sold, EPIRB is replaced, or contact information changes
  • An unregistered or incorrectly registered EPIRB delays SAR response — SAR crews must verify the vessel before deploying resources
  • Registration is free and takes about 10 minutes

EPIRB Battery and Maintenance

Battery Replacement

The battery expiry date is printed on the EPIRB label. Batteries must be replaced before expiry — not when they die. Most EPIRBs use lithium batteries rated for 5 years of standby plus 48 hours of continuous transmission. Only authorized technicians should replace the battery and reseal the unit.

Self-Test and False Alerts

Use only the built-in self-test function — never activate an EPIRB unless in genuine distress. Accidental activations require immediate notification to the nearest USCG station and NOAA. False alerts waste SAR resources and can result in civil penalties. If an EPIRB activates accidentally, secure it and report immediately.

SARTs, AIS-SARTs, and PLBs

SARTs complement EPIRBs — where EPIRBs initiate the alert, SARTs help searching vessels and aircraft home in on the survivors. Understanding how each device operates and their differences is essential for the exam.

SART

Search and Rescue Transponder
  • Frequency: 9 GHz (X-band radar)
  • Operation: Passive — responds only when interrogated by radar
  • Display: 12 dots on radar screen extending from SART position toward radar
  • Range: Up to 10 nm from ship radar; 30+ nm from aircraft radar
  • Battery: 96 hours standby, 8 hours in transmit mode
  • Mounting: Must be mounted as high as possible (at least 1 meter above water) for maximum range

AIS-SART

AIS Search and Rescue Transmitter
  • Frequency: 161.975 MHz and 162.025 MHz (AIS channels)
  • Operation: Active — transmits AIS position reports every minute
  • Display: Shows as a vessel on any AIS display or ECDIS; labeled with MMSI beginning with 970
  • Range: Up to 10 nm from AIS-equipped vessels
  • Advantage: Works with existing AIS receivers; no special radar needed
  • GPS: Many units include GPS for accurate position reporting

PLB

Personal Locator Beacon
  • Frequency: 406 MHz + 121.5 MHz homing
  • Operation: Manual activation only; personal use (not vessel-registered)
  • Satellite: COSPAS-SARSAT — same as EPIRB
  • Key difference from EPIRB: Registered to a person, not a vessel; no hydrostatic release; not a substitute for a vessel EPIRB
  • Registration: NOAA registry — free
  • Battery: Non-replaceable lithium; replace whole unit at expiry
Exam comparison — know these differences:
DeviceFrequencyAuto-activationRegistered to
EPIRB Cat I406 MHzYes (HRU)Vessel
EPIRB Cat II406 MHzNoVessel
PLB406 MHzNoPerson
SART9 GHzNoVessel/raft
AIS-SARTAIS VHFNoVessel/raft

Pyrotechnic Visual Distress Signals

Visual distress signals are required on recreational vessels on coastal waters, the Great Lakes, and territorial seas. Inspected vessels must carry USCG-approved pyrotechnic signals and/or non-pyrotechnic alternatives. All pyrotechnic signals have a 42-month service life from the manufacture date — check the date on every signal.

SignalDay/NightAltitude
Parachute Rocket Flare (Red)Night — primary / Day — visible300+ meters
Hand Flare (Red)Day or NightN/A — hand-held
Orange Smoke SignalDay — primaryN/A — surface level
White Parachute FlareNight — warning only300+ meters

Storage Requirements

  • Store in a cool, dry, accessible location — ideally a waterproof flare kit
  • Do not store in direct sunlight or engine compartment (heat degrades propellant)
  • Keep accessible from the cockpit or helm station — not deep in a locker
  • Store away from fuel and flammable materials
  • Inspect for corrosion, moisture, and damage before each offshore passage

Disposal of Expired Signals

  • Do NOT throw expired flares overboard — marine pollution violation
  • Do NOT place in household trash — fire hazard
  • Contact local fire department, USCG station, or marine dealer for disposal programs
  • Some municipalities hold hazardous waste collection days
  • Expired signals may be retained as backup but do not count toward USCG requirements

How to Fire a Parachute Rocket Flare

  1. Remove from canister; read directions — different brands have different firing mechanisms
  2. Hold at arm's length, pointed 15° off vertical downwind to prevent sparks falling on crew
  3. Fire: twist, uncap and push, or pull — depending on model
  4. Do not point at aircraft — risk of collision or engine ingestion
  5. After firing, confirm the parachute deployed and the signal is burning — fire a second if the first fails
  6. Wait 10–15 minutes before firing a second — conserve signals; fire in response to confirmed search aircraft

Line Throwing Appliances

Line throwing appliances project a light line to a vessel or person in distress, enabling the transfer of a heavier hawser for towing or rescue. They are required on certain inspected vessel classes under 46 CFR 160.040.

Lyle Gun

  • Type: Powder-actuated cannon that fires a projectile trailing a line
  • Range: 230 meters (250 yards) minimum under USCG standards
  • Line: Whip line (light) attached to heaving line and ultimately to hawser
  • Use: Shore-based rescue, vessel-to-vessel in severe weather
  • Named for: David Lyle (1845–1937), USCG engineer who developed the standard design

Rocket Line Thrower

  • Type: Rocket or pyrotechnic device that propels a line
  • Range: Minimum 230 meters horizontally
  • USCG approval: Must meet 46 CFR 160.040 performance standards
  • Service life: Follow manufacturer's inspection and replacement schedule
  • Training: Operators must be trained — misfires and line tangles are common if unfamiliar with device
Exam note: The minimum range of 230 meters (approximately 750 feet) is a specific number the exam may ask about. Line throwing appliances are required on all inspected passenger vessels and commercial vessels over certain sizes. Know the range.

Rescue Boats and Workboats

Inspected vessels over certain sizes and carrying certain numbers of passengers are required to carry rescue boats or workboats capable of recovering persons from the water. Requirements are vessel-type specific under 46 CFR Subchapter T (small passenger) and Subchapter K (small passenger — high speed).

Requirements for Inspected Vessels

When a Rescue Boat is Required

  • Passenger vessels over 100 GT on international voyages
  • Vessels where a liferaft cannot be boarded from the deck
  • Vessels operating on exposed or offshore routes as determined by the OCMI
  • Rescue boat must be capable of launching and recovering in the vessel's worst operating conditions

Rescue Boat Standards

  • Must be self-bailing or be a rigid inflatable (RIB)
  • Must be capable of 6 knots for at least 4 hours
  • Must have engine, compass, searchlight, first aid kit, painter, and bailing equipment
  • Launch and recovery equipment (davit or crane) must function independently of main vessel power
Subchapter T vessels (small passenger, under 100 GT): Must carry a workboat or rescue boat if carrying more than 12 passengers overnight, or if operating more than 3 nautical miles from shore on exposed waters. The specific workboat requirement is often tested in the context of overnight passenger vessel certificates.

Abandonment Procedures

Abandoning ship is the last resort — only done when staying aboard is more dangerous than leaving. The sequence must be drilled so it is reflexive. On inspected vessels, muster drills are required before departure or within 24 hours of sailing for passengers.

1
Sound Alarm + MAYDAY
Sound abandon ship alarm. Transmit MAYDAY on VHF Ch 16: vessel name, position (lat/lon or range and bearing from landmark), nature of distress, persons aboard, vessel description.
2
Activate EPIRB
Manually activate the EPIRB if it has not already deployed automatically. Confirm it is transmitting (strobe and indicator light).
3
Muster Crew and Passengers
All persons to muster station in properly fitted lifejackets. Account for everyone. Assign tasks (raft deployment, grab bag, injured persons).
4
Prepare Grab Bag
EPIRB (if portable), handheld VHF, flares, freshwater, first aid kit, mirror, food, knife. Pre-packed survival bags should be kept near the raft.
5
Deploy Liferaft
Attach painter line to a strong point. Throw canister over the leeward side. Pull painter line firmly until CO2 inflates the raft (may require a sharp tug). Confirm raft has inflated correctly.
6
Board the Raft
Board from the vessel if possible — avoid jumping into the raft. Assist injured and non-swimmers first. Never board an uninflated raft.
7
Cut Painter Line
Cut the painter only after all persons are aboard and the vessel is sinking. Keep the boarding ladder in the water as long as possible. Move clear of the sinking vessel.
8
Post-Abandonment Actions
Stream the sea anchor to reduce drift. Activate any additional signals. Take seasickness medication immediately. Ration water. Maintain a watch schedule.

MAYDAY Call Format

MAYDAY MAYDAY MAYDAY
This is [vessel name] [vessel name] [vessel name]
MAYDAY [vessel name]
Position: [lat/lon or range/bearing]
[Nature of distress]
[Number of persons aboard]
[Vessel type and description]
Over

VHF Channel 16 · 2182 kHz (SSB) · If no response in 1 minute, repeat

Grab Bag Essentials

  • Handheld VHF radio (fully charged)
  • Portable EPIRB or PLB
  • Flare kit (current)
  • Signal mirror
  • Fresh water (minimum 500 ml per person)
  • High-energy food bars
  • First aid kit
  • Knife (non-locking, serrated)
  • Seasickness medication
  • Vessel documents (insurance, registration)

Muster Drill Requirements

Passenger Vessel Requirements (46 CFR)

  • Muster drill required before departure or within 24 hours for overnight passengers
  • Crew assigned to muster stations and duties before getting underway
  • Drill must cover: donning lifejackets, muster signal, location of survival craft, duties during emergency

Crew Training Requirements

  • Crew must be trained in all LSA aboard before vessel gets underway
  • Immersion suit drills: crew must don suits under observation
  • Fire and boat drills: required at intervals specified by vessel certificate
  • Records of drills must be maintained in the official log

USCG Inspection Requirements — 46 CFR LSA Regulations

Life-saving equipment on inspected vessels is regulated primarily under 46 CFR Subchapter W (Lifesaving Appliances and Arrangements) and referenced in vessel-class subchapters. The key regulatory parts are frequently tested on the exam.

CFR PartSubject
46 CFR 160Equipment Approval Standards
46 CFR 160.049Immersion Suit Approval
46 CFR 160.151Inflatable Liferaft Approval
46 CFR 160.171Immersion Suit Performance
46 CFR Part 180Subchapter T — Small Passenger Vessels
46 CFR Part 199Lifesaving Appliances for All Ships
33 CFR 83.38Distress Signals (Inland Rules)

Annual vs. Periodic Servicing

Annual: Inflatable liferaft canister inspection, EPIRB battery and hydrostatic release check, immersion suit inspection
Every 2 years: HRU (hydrostatic release unit) replacement or recertification
Before expiry date: EPIRB battery, pyrotechnic signals (42-month from manufacture), SART battery (96-hour capacity must be maintained)
Each use season: Visual inspection of PFDs, immersion suits, raft canister for damage; confirm all equipment is present

USCG Inspection Points

  • PFDs: correct number, proper size, USCG approval, accessible (not locked away), undamaged
  • Throwable device: accessible, in good condition, line attached and not tangled
  • Pyrotechnics: current (within 42 months), proper count for vessel class and operating area
  • EPIRB: registered, battery current, hydrostatic release functional, properly mounted
  • Liferaft: canister service date current, HRU date current, painter attached to strong point
  • Immersion suits: proper fit, annual inspection current, accessible, not deteriorated

Practice Problems with Solutions

Q1: What is the minimum buoyancy required for a Type I PFD for an adult?

Answer: 22 pounds

Type I PFDs (Offshore Life Preservers) must provide at least 22 lbs of buoyancy for adults. This is significantly more than Type II and III (15.5 lbs each) and is why Type I is the only type specifically designed to turn an unconscious person face-up in rough, open water. Type I for children requires 11 lbs minimum. This number appears directly on USCG exam questions.

Q2: A vessel's EPIRB activates accidentally while in port. What should the captain do immediately?

Answer: Secure the EPIRB and immediately notify the nearest USCG station and NOAA.

An accidental EPIRB activation initiates a SAR response within minutes. The captain must: (1) Turn off or cover the EPIRB to stop transmission. (2) Call USCG on VHF Ch 16 to cancel the alert — give vessel name, MMSI, EPIRB registration number, and confirm it was accidental. (3) Contact NOAA at 1-888-212-SAVE (7283). Failure to cancel can result in SAR resources being deployed at significant cost, and repeat false alerts can result in civil penalties under 47 CFR.

Q3: An inflatable liferaft canister was last serviced 14 months ago. Is it in compliance?

Answer: No — it is out of compliance. Annual inspection is required.

Inflatable liferaft canisters must be inspected at a USCG-approved service facility annually (every 12 months). At 14 months, the canister is 2 months overdue. A vessel carrying an out-of-service liferaft is deficient and the USCG can issue a deficiency citation during inspection. The vessel should not operate on routes requiring the raft until the service is completed and a new service label is attached. Note: some manufacturers have received approval for 30-month service intervals — check the label.

Q4: A SART is activated aboard a survival craft. What will a searching vessel see on its radar?

Answer: A series of 12 dots extending from the SART position toward the searching vessel on the radar display.

A SART operates on 9 GHz (X-band radar frequency). When the searching vessel's radar sweeps across the SART, the SART responds with a series of rapid pulses that appear as 12 equally spaced dots on the radar display. The dots extend from the SART toward the radar — the dot closest to the SART position is the actual position; the line extends in the direction of the searching radar. As the searching vessel gets closer (within about 1 nm), the dots become arcs and eventually a full circle of 12 concentric rings. The SART also has an internal audible and visual indicator alerting survivors that a radar is sweeping them.

Q5: What is the maximum time allowed to don an immersion suit without assistance?

Answer: 1 minute (60 seconds)

This is the most frequently tested immersion suit fact on the USCG exam. Under 46 CFR 160.171 and SOLAS LSA Code requirements, an immersion suit must be capable of being donned — without assistance, over normal clothing — within 1 minute. This requirement drives the design: large zippers, simple closures, and a single-entry design. Crew members on inspected vessels must demonstrate they can meet this requirement during drills. The 1-minute clock typically starts when the person picks up the suit.

Q6: Which pyrotechnic signal is most effective as a daytime distress signal?

Answer: Orange smoke signal

Orange smoke signals are the primary daytime visual distress signal because the bright orange color contrasts strongly against both water and sky, and the smoke column is visible for several miles in calm conditions. Smoke signals are ineffective at night and in high winds (smoke disperses quickly). For nighttime distress, the parachute rocket flare is most effective. Red hand flares work day or night but are most visible at night. Many mariners carry both — orange smoke for day, red rocket or hand flare for night.

Q7: What is the purpose of the weak link in a liferaft painter line system?

Answer: To allow the raft to break free if the sinking vessel pulls it under water.

The weak link has a breaking strength of approximately 2.2 kN (about 500 lbs force). When the vessel sinks and begins pulling the inflated raft downward, the painter tension exceeds the weak link's breaking strength and it snaps — freeing the raft to float to the surface rather than being dragged down with the vessel. This is a safety feature that prevents the raft from being lost with the ship. The weak link is NOT the same as the HRU (hydrostatic release unit), which releases the raft canister from the vessel's cradle automatically — the weak link is in the painter line itself.

Q8: What is the minimum range requirement for a line throwing appliance under USCG standards?

Answer: 230 meters (approximately 250 yards)

Line throwing appliances must project a line to a horizontal distance of at least 230 meters under 46 CFR 160.040. This applies to both the Lyle gun and rocket-type line throwers. The 230-meter figure is a specific regulatory number that appears on the USCG exam. The line itself must be of sufficient strength and length to bridge the gap to a vessel or person in distress and then support the transfer of a heavier towing line.

Q9: A Type V inflatable PFD is aboard. Does it count as a required PFD if it is stowed in a bag?

Answer: No — a Type V PFD must be worn to count as required equipment.

This is a critical distinction for the exam. Type V PFDs (including inflatable PFDs) are only compliant as a required PFD when they are actually being worn by the person for whom they are intended. A Type V stored in a bag or lifejacket box does NOT satisfy the USCG requirement — you need an additional PFD of Type I, II, or III for that person. The approval label on a Type V will state the condition of use. Additionally, inflatable PFDs are not approved for children under 16, persons weighing less than 80 lbs, or persons who cannot swim.

Q10: How does a SOLAS-pack liferaft differ from a coastal-service liferaft in terms of equipment?

Answer: SOLAS pack is a full survival kit; coastal pack is reduced.

A SOLAS A or B equipment pack contains: bailers, sponges, sea anchors, paddles, knife, repair kit, fishing equipment, fresh water (1.5 liters per person for SOLAS A), food (rations for SOLAS A), first aid kit, seasickness tablets, signal mirror, whistle, parachute signals (4), hand flares (6), smoke signals (2), flashlight, compass, and instructions. A USCG coastal service pack is a subset of this — fewer rations, fewer signals, and may not include food. Vessels on international voyages must carry SOLAS-pack rafts; vessels on domestic coastal routes may use coastal-service rafts.

Frequently Asked Questions

What is the donning time requirement for an immersion suit on the USCG exam?

USCG regulations require that a person be able to don an immersion suit in 1 minute or less without assistance. This is a firm regulatory standard under 46 CFR 160.171. Immersion suits must be individually fitted, regularly inspected, and stored in an accessible location. The 1-minute requirement is frequently tested on the OUPV and Master exams.

What is the difference between a Category I and Category II EPIRB?

A Category I EPIRB activates automatically when it floats free of a sinking vessel via a hydrostatic release, and can also be manually activated. A Category II EPIRB is manual-activation only — it must be hand-deployed. Both operate on 406 MHz and are detected by the COSPAS-SARSAT satellite system. Category I EPIRBs are required on most inspected vessels operating beyond certain limits. Both types must be registered with NOAA.

What are the five types of PFDs and when is each required?

Type I (Offshore Life Preserver): 22 lbs buoyancy, designed to turn an unconscious person face-up, required on uninspected vessels beyond 3 miles. Type II (Near-Shore Buoyant Vest): 15.5 lbs buoyancy, may turn unconscious person face-up in calm water, acceptable for nearshore use. Type III (Flotation Aid): 15.5 lbs buoyancy, does NOT turn unconscious person face-up, for conscious wearers in calm inshore water. Type IV (Throwable Device): ring buoy or buoyant cushion, not worn — thrown to a person in the water. Type V (Special Use Device): inflatable PFDs, deck suits, boardsailing vests — must be worn to count as required equipment.

How often must an inflatable liferaft canister be inspected?

Inflatable liferaft canisters must be inspected at a USCG-approved service facility annually or at the interval specified on the service label, whichever is sooner. The hydrostatic release unit (HRU) that automatically deploys a liferaft when a vessel sinks also has a service interval — typically every 2 years. The painter line connecting the liferaft to the vessel must be rigged so it will deploy the raft as the vessel sinks but allow the raft to break free when the vessel sinks below approximately 4 meters.

What frequencies do EPIRBs and SARTs use and why does it matter?

Modern 406 MHz EPIRBs transmit encoded digital distress signals detected by the COSPAS-SARSAT satellite network, which provides near-global coverage and position accuracy within 5 km (often within 100 meters with GPS-equipped units). A secondary 121.5 MHz homing signal aids SAR aircraft during the final search phase. SARTs (Search and Rescue Transponders) respond on 9 GHz (X-band radar) — when a searching vessel or aircraft radar illuminates the SART, it transmits a series of 12 dots on the radar screen extending from the SART position. This is different from EPIRBs, which initiate the alert. AIS-SARTs broadcast AIS position data and are visible on any AIS display.

What pyrotechnic signals are required to be carried on recreational and inspected vessels?

Under 46 CFR and COLREGS, inspected vessels must carry USCG-approved visual distress signals. Parachute rocket flares are most effective at night — they burn at 300+ meters altitude for 40 seconds. Hand flares provide continuous red light for 1 minute and are visible day or night. Orange smoke signals are the primary daytime distress signal, visible for several miles in calm conditions. All pyrotechnic signals have a 42-month service life from the date of manufacture printed on the device. Expired signals must be disposed of through approved channels — do not throw overboard.

What is the sequence for abandoning ship on an inspected vessel?

The USCG-standard abandonment sequence: (1) Sound the abandon ship alarm and announce MAYDAY on VHF Ch 16 with vessel name, position, nature of distress, number of persons aboard, and vessel description. (2) Activate the EPIRB. (3) Muster all crew and passengers at the designated station in lifejackets. (4) Collect grab bag (EPIRB, flares, water, first aid). (5) Deploy the liferaft — attach painter line, throw canister clear, pull painter until CO2 inflates raft. (6) Board from the vessel if possible — avoid jumping into the raft. (7) Cut the painter only after all persons are aboard and the vessel is about to sink. (8) Stream the sea anchor and maintain watch.

Quick Reference — Numbers to Memorize

22 lbs
Type I PFD buoyancy (adult)
15.5 lbs
Type II / III PFD buoyancy (adult)
1 min
Immersion suit donning time
4 meters
Depth at which HRU activates
Annual
Liferaft canister service interval
2 years
HRU service/replacement interval
42 months
Pyrotechnic signal service life
406 MHz
EPIRB satellite frequency
9 GHz
SART radar response frequency
121.5 MHz
EPIRB homing signal frequency
230 meters
Line thrower minimum range
12 dots
SART radar display pattern
48 hrs
EPIRB minimum battery life (transmit)
96 hrs
SART standby battery life
10 nm
SART ship radar detection range

Drill LSA until the numbers are automatic

1,628+ practice questions including dedicated LSA sections covering PFDs, EPIRBs, immersion suits, liferafts, and pyrotechnics. Explanations for every question. Track your weak spots by topic.

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