|
(0015036)
|
|
zed
|
|
10-12-2014 20:47
|
|
http://efele.net/maps/tz/world/
Timezones at sea
The tz database says: “A ship within the territorial waters of any nation uses that nation's time. In international waters, time zone boundaries are meridians 15° apart, except that UTC−12 and UTC+12 are each 7.5° wide and are separated by the 180° meridian (not by the International Date Line, which is for land and territorial waters only). A captain can change ship's clocks any time after entering a new time zone; midnight changes are common.”
While the boundaries in international waters are not difficult to construct, the boundaries of territorial waters are a completely different story, and are similar to the boundaries between countries. Unfortunately, VMAP0 does not provide geometries for the territorial waters. As a consequence, the shapefiles presented here do not cover seas and oceans. |
|