Coll Regs Question - Lights

As far as I know same as any other vessel, so will depend on it's length, submarines can be less than 7 metres, or much larger. Can have flashing yellow as well, between 90 and 105 flashes per minute.

There are some inland water laws that require special amber flashing lights, with a different flashing sequence.
 
As said the normal lights for a power driven vessel

BUT

the relative positioning is a bit odd as the forward masthead light may low down at the bow. The side lights are on the conning tower and so is the other masthead light. IIRC the side lights are higher than the forward masthead light. I don't know where the stern light is

The first time you see one you you think WTF is that.

Only seen one once and is was a puzzle at first but it passed close enough to actually see what it was.
 
On all the RN submarines I served on, the masthead light was on a stub mast on top of the fin, together with an all round amber flasher locally known as a Grimes Light. The overtaking light is sited on top of the part of the rudder seen above the surfaced waterline. Port and Starboard bowlights on either side of the fin below the bridge and can be rotated to a stored position to reduce underwater drag, and therefore noise.

http://www.royal-navy.mod.uk/server/show/nav.2419

is interesting, for those so inclined!
 
The older diesel boats had two steaming lights, the ford lower one being placed ahead of the sonar dome on the bow, which was ok in a flat calm but about as much use as a chocolate frog in any sea way. The overtaking light was mounted on the back of the fin.

The grimes light was in my day an American affectation and on at least one occasion in the clyde resulted in a breakdown wagon on the Isle of Bute being mistaked for an SSBN from the Holy Loch.
 
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