Originally Posted by walruz
I guess I'll look round for a tricolour single light
Unfortunately they are only legal for yachts (well, sailing vessels to be strictly accurate!)
Light on a pole insn't too difficult. Easiest options are - buy one off the shelf, or I have used an alu aeriel pole, built a small wooden "plug" adaptor & screwed a deck mount ARW to it. Plan C is you get a "pole mount" off the shelf & bang it straight onto a length of Alu pole(as sold by every TV aeriel supplier in the country).
As for the anchor light idea, I've got two cables going to the Frame - one for the R/Gs and one for the ARW, Used a DPDT centre off switch, One set of contacts, both "on" terminals connected to the white, the other side only one to the R/G. One switch, two functions - means that if at anchor or on Aux (no charging capacity) I can run at 1/3 the power consumption of normal, and also means you can't get the sidelights without the white, which would be illegal on all counts.