White light all-round?

[bassfan]

The other important note with nav lights is you can tell the direction of travel of a vessel, but only if they are configured correctly. For example, if you can see red green and white, you know the vessel is heading for you, if you only see white you know you are heading to it (hence the reason for all round white at rest).

If configured correctly it is possible to tell the angle of approach too. See only red and white, you know the boat that you see is heading about 56deg off your port side (if you are travelling toward the other vessel)

In theory correct, but there can be some confusion when you can only see a white light. For example a single white light can mean you are either looking at an anchored vessel, OR a power vessel from behind that is moving away, OR a sailing vessel from behind. The good news is that the other vessel is either anchored or moving away from you and therefore is not a threat to your vessel.

BF

[IRMC000]

Unless you are less than 7m and less than 7 knots - only one white light underway - but I'm going to put red/green as well.

In theory correct, but there can be some confusion when you can only see a white light. For example a single white light can mean you are either looking at an anchored vessel, OR a power vessel from behind that is moving away, OR a sailing vessel from behind. The good news is that the other vessel is either anchored or moving away from you and therefore is not a threat to your vessel.

BF