Print this out and tape to your fog horn canister?
In or near an area of restricted visibility, whether by day or night, the signals prescribed in this Rule shall be used as follows:
1.Long. Under power, making way (sound every 2 minutes)
2.Long, long. Under power, not making way (sound every 2 minutes)
3.Long, short, short. Towing, fishing, restricted ability to maneuver, sailing, and NUC (sound every 2 minutes)
4.Long, short, short, short. Manned vessel being towed (sound every 2 minutes)
5.Bell for 5 seconds At anchor (sound every minute)
6.Short, short, long. You are running into danger (also 5 shorts)