Module 1 - Nautical Terms
Yachtmaster Offshore Standard: Terms
A command update should make the navigation picture easier to act on. Start with the evidence and its age, distinguish observations from estimates, then state the safe-side limit and the first action. Avoid a long glossary recital when a short labelled instruction is needed.
Use one direction reference throughout the brief or state every conversion. 'Steer 045' is incomplete if the helm does not know whether it is true, magnetic or compass. 'The lighthouse bears 045' is also incomplete unless the observer and reference are clear.
Protect a margin rather than defending a plan after the margin has gone. A clearing bearing, depth limit, tidal-gate time or lee-shore distance needs a trigger and an action that can be taken early. The conservative alternative should be visible before workload rises.
Close the loop on critical details. Ask the responsible crew member to repeat the safe side, reference and trigger in their own short words, then monitor the action. This is an operational teaching technique for reducing ambiguity, not a claim that one fixed script fits every vessel or examination.
| Weak update | Command-level revision | Remaining check |
|---|---|---|
| The tide is wrong | Observed track differs from the EP assumption | Recheck fix, inputs and time |
| Watch the transit | Report when the identified front mark closes the rear mark | Confirm correct objects and geometry |
| Keep clear of the shoal | Keep the object on the briefed safe side of 312°T | Confirm charted limit, reference and margin |
| We should make the gate | Latest acceptable time is stated with a turn-away trigger | Update using actual progress and conditions |
Optional quick check
Section 10 of 11
The actual track is left of plan and the clearing margin is reducing. Which response best protects command options?
Sources and factual review
Reviewed 20 August 2026 - Compass Revision editorial review.
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