On 02 May 2012 20:21:00 GMT, bvdb wrote:

Apparently it is OK to use a tri-light at the top of the mast on a sailboat larger than 12M and less than 20M.
When running the engine, however, it appears that you must show a steaming lilght at least 1M above the sidelights.
This appears to mean that the sailboat must have another set of sidelights below the steaming light on a seperate circuit. Is this correct?

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Yes, that is correct, the masthead tri-light can only legally be used
when sailing. Most sailboats have their steaming light mounted about
2/3rds up the front of the mast so you'd need a second set of running
lights down near the deck level.