Everything tested on the USCG captain's license exam for sailing vessel operations: endorsement requirements, points of sail, COLREGS right-of-way and lighting rules, stability, heavy weather tactics, reefing, man overboard under sail, and APEM passage planning.
The Sailing Endorsement authorizes a licensed mariner to operate a sailing vessel carrying passengers for hire. It is added to an existing OUPV (6-Pack) or Master license.
USCG requires documented sailing vessel sea service in addition to the base license requirements:
| Requirement | Minimum | Notes |
|---|---|---|
| Total sailing sea service | 180 days | On sailing vessels only |
| As operator or watchstander | 90 days | Must be in a responsible capacity |
| Logbook documentation | Required | Signed by supervising master or owner |
| Additional exam section | Required | Taken at REC alongside base exam |
Key Rule:
A vessel proceeding under sail AND engine simultaneously is classified as a power-driven vessel under COLREGS. She must display a steaming (masthead) light and is subject to all power vessel right-of-way obligations. This is frequently tested on the exam.
Understanding points of sail and sail trim is fundamental to the sailing endorsement exam. The USCG tests both the definitions and their practical implications for handling and safety.
Sailing as close to the wind direction as possible. Sails are trimmed in tightly. Maximum heel, highest load on rigging. The closest point of sail a vessel can maintain while still making forward progress.
Slightly freer than close-hauled. Sheets eased a little. Typically the fastest and most efficient point of sail for most monohull sailing vessels.
Wind is directly abeam. Sails are roughly halfway out. Generally a comfortable and fast point of sail with moderate heel.
Wind is coming from behind and to one side. Sheets are eased well out. Risk of accidental jibe increases as you bear away further.
Wind directly behind the vessel. Mainsail is fully out to one side; a poled-out headsail may be on the other side (wing-and-wing). Highest risk of accidental jibe. Boat motion is often uncomfortable in a seaway.
Sailing vessels cannot make progress directly into the wind. The arc within approximately 30-45 degrees either side of the true wind direction is called the no-go zone. A vessel caught in irons (stalled head-to-wind) loses steerage and must be backed out by backing the headsail or using the engine.
Tacking and jibing are the two maneuvers used to change direction relative to the wind. Understanding the difference and the correct procedure for each is heavily tested.
Tacking turns the bow through the wind. The vessel goes from close-hauled on one tack to close-hauled on the other, passing through the no-go zone. It is the safe maneuver for changing direction upwind.
Tacking Procedure
Jibing turns the stern through the wind. The vessel bears away until the wind crosses from one quarter to the other. The mainsail crosses with force — a controlled jibe is essential to prevent injury or damage.
Jibing Procedure
Safety Warning — Accidental Jibe
An accidental jibe occurs when running downwind and the wind shifts or the helm wanders past dead downwind. The boom swings across violently with no warning. Prevention: use a preventer (line from boom end to bow cleat), maintain an angle of 10-15 degrees off dead downwind, and assign a dedicated helmsman in following seas.
COLREGS Rules 12 and 25 are the core sailing-specific rules tested on the USCG exam. You must know both the hierarchy of stand-on/give-way obligations and the specific light configurations.
Rule 12 applies only when both vessels under consideration are sailing vessels (not motoring). The give-way hierarchy in Rule 12 is:
A vessel on the port tack (wind coming from the port side, boom to starboard) must give way to any vessel on the starboard tack.
When both vessels are on the same tack, the vessel to windward (upwind) is the give-way vessel. The leeward (downwind) vessel is stand-on.
A port-tack vessel that cannot determine the tack of the other vessel must assume the other is on starboard tack and keep clear.
Rule 18 Exception — Sailing Vessel Give-Way Situations
Despite Rule 12, a sailing vessel must keep clear of the following regardless of tack:
| Vessel Size | Required Lights | Options |
|---|---|---|
| Any sailing vessel underway | Sidelights (red/green) plus sternlight (white) | Tricolor at masthead instead (vessels under 20m) |
| Sailing vessel under 20 m | Combined tricolor masthead lantern | Cannot show tricolor AND separate sidelights/stern simultaneously |
| Optional additional lights | Red over green all-round lights at masthead | Cannot be shown with tricolor lantern |
| Vessel under sail AND engine | All power-vessel lights required | Must add steaming (masthead forward) light; no tricolor |
| Sailing vessel under 7 m | Sidelights and sternlight if practicable | At minimum: flashlight or lantern to prevent collision |
Sailing vessel stability differs fundamentally from power vessel stability because the sail plan generates heeling force as a constant operating condition. Understanding how stability is measured and lost is critical for the exam and for safe offshore operation.
The righting moment is the force that returns a heeled vessel to upright. It is expressed as the righting lever (GZ) — the horizontal distance between the center of gravity (G) and the center of buoyancy (B) at any given angle of heel. Plotting GZ against heel angle produces the stability curve.
The Angle of Vanishing Stability is the heel angle at which GZ returns to zero — the vessel is no longer self-righting. Heel beyond AVS and the vessel inverts (capsizes).
A knockdown is a temporary heel beyond 90 degrees from which the vessel self-rights. Capsize occurs when heel exceeds AVS. Risk factors for capsize in sailing vessels:
Heavy weather management is a high-priority topic for the sailing endorsement exam. The USCG expects candidates to know when and how to apply each tactic and the tradeoffs involved.
Reefing reduces sail area to match the wind strength. The golden rule: reef early, before conditions deteriorate further. A well-reefed boat is faster and safer than an over-powered one.
Slab (Jiffy) Reefing Steps
Heaving-to creates a balanced near-stationary position. The backed headsail pushes the bow off; the leeward-lashed helm turns the bow back up; the small, eased main balances the two forces. The result is a gentle fore-reach at 1-3 knots, bow 40-60 degrees off the wind.
Procedure
Best Uses
Lying ahull means striking all sail and allowing the vessel to drift beam-to with the helm lashed. The vessel naturally takes up a position roughly beam-on to wind and sea. It requires minimum crew effort.
Running off means bearing away downwind in storm conditions, running before the sea with minimal sail (or no sail, using a drogue). The advantages are reduced apparent wind and reduced sea impact angle. The risks include broaching and surfing bow-down into the back of the next wave.
| Tactic | Wind/Wave Angle | Capsize Risk | Best Condition |
|---|---|---|---|
| Heave-to | 50 deg off wind | Low | Moderate to severe storm |
| Lie Ahull | 90 deg (beam-on) | High | Mild to moderate only |
| Run Off | 150-180 deg | Moderate | Sea room available downwind |
Man overboard (MOB) recovery under sail requires immediate action and a practiced procedure. The USCG exam tests both the maneuver options and the priority sequence of actions.
Figure-8 (Preferred — Exam Standard)
Bear away on a beam reach for approximately 6 boat lengths, then tack and return close-hauled on the reciprocal heading. The final approach is made close-hauled, slowing the vessel as the sails luff, arriving alongside the victim on the leeward side.
Advantage: approach on close-hauled course — predictable speed control via sheets.
Quick Stop (Crash Tack)
Immediately tack without releasing the jib sheet (heave-to), then jibe around and approach. This keeps the vessel close to the victim throughout and minimizes distance traveled away from them.
Best when: victim sighted, sea room tight, or crew is small.
Reaching Approach
Bear away onto a reach, jibe around, and approach from downwind on a beam or close reach, spilling wind to control speed in the final 2-3 boat lengths.
Used when: plenty of sea room, experienced helmsman.
COLREGS Rule 19 governs vessel conduct in restricted visibility. Sailing vessels have additional sound signal obligations under Rule 35 that differ from power vessels.
| Vessel Status | Signal | Interval |
|---|---|---|
| Sailing vessel underway | One long, two short blasts | Every 2 minutes |
| Power vessel underway, making way | One prolonged blast | Every 2 minutes |
| Power vessel underway, stopped, not making way | Two prolonged blasts | Every 2 minutes |
| Vessel at anchor (under 100m) | Bell rung rapidly for 5 seconds | Every minute |
APEM — Appraise, Plan, Execute, Monitor — is the four-phase passage planning framework required by SOLAS Regulation V/34 and tested on the USCG license exam. Licensed mariners are expected to apply it before every significant voyage.
Gather all available information before departure. For coastal sailing this means:
Lay out the complete route on the chart and in the GPS before departure:
Depart and follow the plan, managing the vessel underway:
Continuously assess plan vs. actual conditions and update as needed:
Common questions from captain's license candidates about sailing vessel operations and the sailing endorsement.
The USCG Sailing Endorsement is an add-on authorization to an OUPV or Master license that permits commercial operation of a sailing vessel carrying passengers for hire. Anyone conducting paid sailing charters, providing sailing instruction for compensation, or operating a commercial vessel under sail must hold this endorsement in addition to their base license.
USCG requires a minimum of 180 days of sea service specifically on sailing vessels, with at least 90 of those days served as operator or watchstanding officer. This is on top of the base sea time for your underlying license. All days must be documented in a signed logbook.
COLREGS Rule 12 governs sailing vessel right-of-way. The hierarchy is: (1) a vessel on port tack gives way to a vessel on starboard tack; (2) on the same tack, the windward vessel gives way to the leeward vessel; (3) a port-tack vessel that cannot determine the other vessel's tack treats the other as starboard tack and gives way.
Under COLREGS Rule 25, a sailing vessel underway must show sidelights (red to port, green to starboard) plus a white sternlight, or a combined tricolor lantern at the masthead (vessels under 20 meters). The optional red-over-green all-round lights may be added but NOT simultaneously with the tricolor. A vessel under sail AND engine must show power vessel lights including a steaming light.
The angle of vanishing stability (AVS) is the heel angle at which a vessel's righting moment reaches zero and the vessel will capsize if heeled further. It is important for the USCG exam because offshore sailing candidates must demonstrate understanding of capsize risk. An AVS of at least 120 degrees is considered the minimum for offshore passages.
Heaving-to is a heavy weather management tactic where the headsail is backed, the mainsheet eased, and the helm lashed to leeward. The vessel settles into a near-stationary fore-reach with the bow approximately 50 degrees off the wind. It is used to allow crew to rest, make repairs, wait for weather to improve, or manage storm conditions with minimal sail exposure.
APEM stands for Appraise, Plan, Execute, Monitor — the four-phase passage planning framework required by SOLAS and tested on the USCG exam. Appraise covers gathering charts, tide tables, and weather. Plan lays out waypoints, tidal gates, and contingency diversions. Execute is the underway phase. Monitor is the continuous watch cycle of position fixing, weather updates, and plan revision.
These terms appear regularly on the USCG sailing endorsement exam. Know each definition precisely.
NailTheTest includes dedicated sailing vessel operations practice — Rule 12, Rule 25, points of sail, heavy weather tactics, stability, and passage planning. Over 1,000 questions, detailed explanations, and realistic timed exams built from actual USCG question banks.
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