Garmin Personal Navigator GPS 100AVD Owner's Manual page 113

LOCAL TIME TO UTC TIME CONVERSION
To find UTC time from your local time, add the adjustment for your longitude
zone given below. (If you are in a daylight savings time zone, subtract one
hour from the adjustment.) For example, if you are at longitude W081°00.00'
and your local time is 11:00 standard time, add 5 hours to obtain UTC time
which is 16:00.
Longitude Zone
W180.0°
W172.5°
W157.5°
W142.5°
W127.5°
W112.5°
W097.5°
W082.5°
W067.5°
W052.5°
W037.5°
W022.5°
W007.5°
E007.5°
E022.5°
E037.5°
E052.5°
E067.5°
E082.5°
E097.5°
E112.5°
E127.5°
E142.5°
E157.5°
E172.5°
NOTE: The time zone boundaries given above may be different depending
on your area. Consult your charts for more accurate information concerning
time zones.
APPENDIX C
to W172.5°
to W157.5°
to W142.5°
to W127.5°
to W112.5°
to W097.5°
to W082.5°
to W067.5°
to W052.5
to W037.5°
to W022.5°
to W007.5°
to E007.5°
to E022.5°
to E037.5°
to E052.5°
to E067.5°
to E082.5°
to E097.5°
to E112.5°
to E127.5°
to E142.5°
to E157.5°
to E172.5°
to E180.0°
Adjust
+12
+11
+10
+ 9
+ 8
+ 7
+ 6
+ 5
+ 4
+ 3
+ 2
+ 1
0
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
-10
-11
-12
C-1