Deck 2014: General Navigation

1. A Sound the request-for- opening signal for the first  bridge only, who will notify the second bridge of your approach
2. B Sound the request-for- opening signal twice in succession to indicate you must pass through both bridges
3. C Sound the request-for- opening signal, pause for about 10 seconds, then sound two prolonged blasts.
4. D Sound the request-for- opening signal and, after the bridge acknowledges it, sound the request-for- opening signal for the second bridge.

Tip: press A-D to answer