Appendix F: Time Offsets - Garmin GPSMAP 178 Owner's Manual

Appendix F
Time Offsets
H
A simple way to determine your local time offset is how
many hours you are behind or ahead of UTC (also called
'Greenwich' or 'zulu' time).
Example: EST (Eastern Standard Time) is 5 hours behind
UTC, so your offset would be -5. Adding one hour for day-
light savings would make EDT (Eastern Daylight Time)
- 4. Subtract an hour for each time zone as you travel west.
Offsets for Continental U.S. would be:
EST -5
CST -6
MST -7
PST -8
0
The chart below gives an approximate UTC (Universal Time Coordinate) time offset for the various
longitudinal zones. Check with local charts for more detailed information. If you are in daylight
savings time, add one hour to the offset.
Longitudinal Zone
W180.0º to W172.5º
W172.5º to W157.5º
W157.5º to W142.5º
W142.5º to W127.5º
W127.5º to W112.5º
W112.5º to W097.5º
W097.5º to W082.5º
W082.5º to W067.5º
W067.5º to W052.5º
W052.5º to W037.5º
W037.5º to W022.5º
EDT -4
W022.5º to W007.5º
CDT -5
W007.5º to E007.5º 0
MDT -6
PDT -7
Offset
Longitudinal Zone
-12
E007.5º to E022.5º
-11
E022.5º to E037.5º
-10
E037.5º to E052.5º
-9
E052.5º to E067.5º
-8
E067.5º to E082.5º
-7
E082.5º to E097.5º
-6
E097.5º to E112.5º
-5
E112.5º to E127.5º
-4
E127.5º to E142.5º
-3
E142.5º to E157.5º
-2
E157.5º to E172.5º
-1
E172.5º to E180.0º
Offset
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12