Operation Manual
Table Of Contents
- GPSMAP 172/172C
- Introduction
- Getting Started
- Keypad Usage
- Selecting Options
- Entering Data
- Initializing the Receiver
- Power On/Screen Backlighting
- Simulator Mode
- Main Pages/Map Page
- Map Cursor
- Marking Waypoints
- Using the NAV Key
- Simulated Tour
- Reviewing/CreatingMap Waypoints
- Compass Navigation Page
- Highway Page
- Active Route Page/Main Menu Page
- Deleting Waypoints/Powering Off Unit
- Reference
- Map Page
- Map Page: Cursor
- Map Page: Options
- Compass Page
- Highway Page
- Highway Page Options
- Creating Waypoints
- Reviewing/Editing Waypoints
- Waypoint Lists
- Going to a Destination
- TracBack Navigation
- MOB: Man OverBoard
- Creating Routes
- Creating a Route/Following a Route
- Route List Page
- Route Review Page
- Editing Routes
- Active Route Page
- Find Key
- Find Options
- Main Menu Tabs
- Main Menu:GPS Tab
- Main Menu:Tide Tab
- Main Menu: Trip/
- Main Menu: Track Tab
- Main Menu: DSC Tab
- Main Menu: DSC/Card Tabs
- Main Menu: Temp Tab/Setup Tab
- Main Menu: Comm Tab
- Main Menu: Alarm Tab
- Appendix
- Index
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 Offset
W180.0º to W172.5º -12
W172.5º to W157.5º -11
W157.5º to W142.5º -10
W142.5º to W127.5º -9
W127.5º to W112.5º -8
W112.5º to W097.5º -7
W097.5º to W082.5º -6
W082.5º to W067.5º -5
W067.5º to W052.5º -4
W052.5º to W037.5º -3
W037.5º to W022.5º -2
W022.5º to W007.5º -1
W007.5º to E007.5º 0
E007.5º to E022.5º +1
E022.5º to E037.5º +2
E037.5º to E052.5º +3
E052.5º to E067.5º +4
E067.5º to E082.5º +5
E082.5º to E097.5º +6
E097.5º to E112.5º +7
E112.5º to E127.5º +8
E127.5º to E142.5º +9
E142.5º to E157.5º +10
E157.5º to E172.5º +11
E172.5º to E180.0º +12
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 EDT -4
CST -6 CDT -5
MST -7 MDT -6
PST -8 PDT -7
Longitudinal Zone Offset
80
Appendix B
Time Offsets