Lux Fiat !
Not being too keen on this waterborne stuff (if the Good Lord had wished us to go to sea, He'd have given us scales and gills - and also look what water does to your boots !), I hasten to add two caveats:
Do not be troubled by the steady red from the caravan when at marshalling point one dark night - it's just the beacon on top of the van !
In the blackout, do not orbit a steady red Pundit on the ground, waiting for it to flash an ident - it's your port wingtip nav light !
(Both true stories, one culled from "Tee Emm", the other my own experience)
Danny.