@eaconag: How do you know if there's a risk of collision? It's rather simple. The bearing does not appreciably change! (True bearing because the relative bearing changes when there are changes to your heading) Watch the end video for an actual footage. #maritime #seaman #seafarer #merchantmarine Disclaimer: Consult the official COLREG book for accurate maritime navigation rules. This post offers general insights and should not be considered a substitute for professional advice.