What does Rule 5 (Lookout / Vigilancia) of the Collision Regulations (RIPA) require of every vessel at all times?

1. Maintaining an active radio conversation on VHF channel 16 with neighboring craft
2. Maintaining a proper lookout by sight and hearing, as well as by all available means appropriate to the circumstances, to make a full appraisal of the situation and risk of collision
3. Keeping at least three crew members stationed at the bow with binoculars
4. Sounding a horn blast every 30 seconds regardless of weather