Just completed a crossing from Jersey to Dartmouth, all went well and was delighted with my recently installed AIS
My only issue (other than lack of wind) was around midnight in the shipping lanes we spotted a vessel showing red over red. I found him on AIS with a CPA too close for my liking but no vessel details we then saw red, white red and altered course. Turned out it was a yacht under motor showing all his lights and what I saw was the port side of his tri-colour, then his steaming light then his port side bow light. As I was seeing his port side I did right to alter course but it was confusing.

What is the view of the forum? Visibility was good but it was very dark and I did not expect him to be showing a tri-colour along with other lights under motor.