Quote:
Originally Posted by aanker
I draw vertical lines 7.5d each side of 180d, and every 15d E and W from those lines.
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This is how actual nautical time zones are laid out. They are unlike civil time zones in that they pay no regard to political boundaries. Each nautical time zone is exactly 15° of longitude from pole to pole and differs from GMT by a number of whole hours. Nautical time zones are typically used once a ship has left the territorial waters of a particular nation.
Here is a chart showing all of the nautical time zones, their phonetic names, hours offset from GMT, starting and ending longitudes, and the longitude upon which they are centered. Notice that there is no "Juliet" time zone. Note also that the "Mike" and "Yankee" time zones (+12h and -12h, respectively) are each only 7.5° wide.