Sound signals trainer
Sound signals are part of the navigation rules and part of safe skippering. Drill the signals a beginner actually needs: maneuvering, danger or doubt, restricted visibility, leaving a dock, and anchoring.
Saved signal mastery
Saved locally in asa101.soundSignals.v1. Export it from Progress backup with the rest of your trainer data.
Listen by ear
Hear the horn first, then identify the signal from context. Browser audio starts after pressing Play.
Build the signal
Build prompt
Fast reference
| Signal | Beginner meaning |
|---|---|
| One short | I am altering course to starboard. |
| Two short | I am altering course to port. |
| Three short | I am operating astern propulsion. |
| Five or more short | Danger or doubt. I do not understand your intentions. |
| One prolonged | Leaving a dock or berth, or warning at a blind bend. |
| One prolonged every 2 minutes | Power-driven vessel making way in restricted visibility. |
| Two prolonged every 2 minutes | Power-driven vessel stopped and making no way in restricted visibility. |
| One prolonged plus two short every 2 minutes | Sailing vessel, towing vessel, fishing vessel, not-under-command vessel, or restricted-maneuverability vessel in restricted visibility. |
| Rapid bell about 5 seconds every minute | Vessel at anchor. Smaller vessels may use another efficient sound signal under the rules. |
Exam memory
Five short blasts is the one ASA 101 students should never miss. It means danger or doubt. Slow down, keep clear, and clarify intentions.
Fog memory
A sailing vessel in fog is not silent. Use one prolonged followed by two short at intervals of not more than two minutes.
Reality check
Small recreational boats still need an efficient way to make sound. A whistle on each PFD is a cheap, practical habit.