All round red.......?

[Corribee Boy]

Perhaps it's just to warn your own helicopter where your mast is?

 

[dharl]

still prefer the low flying Seagull suggestion....

 

[RalphyM]

It's a requirement for the FAA.

Any temporary or permanent structure, including all
appurtenances, that exceeds an overall height of 200
feet (61m) above ground level (AGL) or exceeds any
obstruction standard contained in 14 CFR part 77,
should normally be marked and/or lighted. However,
an FAA aeronautical study may reveal that the
absence of marking and/or lighting will not impair
aviation safety. Conversely, the object may present
such an extraordinary hazard potential that higher
standards may be recommended for increased
conspicuity to ensure safety to air navigation.
Normally outside commercial lighting is not
considered sufficient reason to omit recommended
marking and/or lighting. Recommendations on
marking and/or lighting structures can vary
depending on terrain features, weather patterns,
geographic location, and in the case of wind turbines,
number of structures and overall layout of design.
The FAA may also recommend marking and/or
lighting a structure that does not exceed 200 (61m)
feet AGL or 14 CFR part 77 standards because of its
particular location

Obviously it only applies under FAA controlled airspace so still comes down to willy waving outside this...

 

[alexk]

All round red or more commonly, all round flashing red means dangerous cargo, such as explosives, fuel, gas, etc.,

Correct,
It means that the vessel is carrying-loading-or discharging dangerous cargo, this is also used when loading bunkers(fuel), and given its size and being in falmouth it may have been loading fuel.

flashing red fitted to any korean, chines, jap built ship but red all round usually used instead.