NavList:

Gary

All of this is clear to me. My original query (17284) related to the existence or otherwise of an international standard for zone descriptions.

I was looking at some questions in a Royal Yachting Association Ocean Yachtmaster examination, where examinees were asked to convert to and from ZT/UT, with no information other than the sign of the zone description. Obviously, if the longitude (hemisphere) is known there is no ambiguity, but there IS ambiguity if all you have is a plus or minus sign in front of the zone mumber and don't know which convention is used by the examination board!

I then went googling for time zone maps and found that they were pretty equally divided between negative west and positive west, hence the original query which was answered by Paul Werner. Negative west is ISO and positive west is Bowditch/US convention.

Regards
John
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