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Appendix G
Greenwich Mean Time
(GMT) Offset Chart
Longitudinal Zone Offset
W180.0° to W172.5° -12.00
W172.5° to W157.5° -11.00
W157.5° to W142.5° -10.00
W142.5° to W127.5° -09.00
W127.5° to W112.5° -08.00
W112.5° to W097.5° -07.00
W097.5° to W082.5° -06.00
W082.5° to W067.5° -05.00
W067.5° to W052.5° -04.00
W052.5° to W037.5° -03.00
W037.5° to W022.5° -02.00
W022.5° to W007.5° -01.00
W007.5° to E007.5° -00.00
Longitudinal Zone Offset
E007.5° to E022.5° +01.00
E022.5° to E037.5° +02.00
E052.5° to E067.5° +03.00
E067.5° to E082.5° +04.00
E082.5° to E097.5° +05.00
E097.5° to E112.5° +06.00
E112.5° to E122.5° +07.00
E122.5° to E127.5° +08.00
E127.5° to E142.5° +09.00
E142.5° to E157.5° +10.00
E157.5° to E172.5° +11.00
E172.5° to E180.5° +12.00
This chart is provided to help you determine the time offset settings for your current location in
order to set the correct time on the Time Setup Page. To change the GMT (Greenwich Mean Time)
Offset, if necessary, press the OPTION key to access the Options Menu. Then scroll down to the
System Setup option, press ENTER to access and then tab over to the ‘Time’ page. Highlight the GMT
Offset field and press ENTER to enter the appropriate offset value from the chart below using the UP
or DOWN areas of the ROCKER kepad . To determine your longitudinal zone, press MARK to mark
your position select ‘Show Lat/Lon’ from the options menu and observe the longitude value. It should
fall between one of the sets of values on the chart.
To determine your longitudinal zone: press the
MARK key to mark a waypoint and observe the
longitudinal coordinates by selecting ‘Show Lat/
Lon’ from the options menu.
Match it to a set of values on the chart to the
right and select the Offset value to be entered
in the GMT Offset field on the Time tab of the
System Setup menu.
Because Time Zone boundaries do not always follow vertical longitudinal lines you may, on
occasion, need to adjust the offset by one value in either direction.