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The lights a vessel displays at night define a lot about the vessel, length, aspect etc. Some 'special vessels' display lights that convey their activity. Some of these vessels can be 'underway' (Not tied up or anchored) but not 'making way' The special vessels are fishing vessels (red or green over white), vesels not under control (2 reds) and vessels with restricted ability to manoeuvre (red over white over red). These special vessels can be observed with their navigation lights off but the identifying lights on. This could be say 2 red all round lights. This would be underway but not making way. Switch the nav lights on and it would be making way. All other vessel types would be 'underway'. Cheers. thescr3am.

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Q: How can you make the distinction as to whether a vessel is underway or making way from the lights it displays at night?
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