Garmin G300 Pilot’s Guide
190-00921-00 Rev. D
Appendix D
239
System
Overview
Flight
Instruments EIS
COM
Interface
GPS
Navigation
Flight
Planning
Hazard
Avoidance
Additional
Features
Integrated
Autopilot Annun/Alerts Appendix Index
APPENDIX D: MAP DATUM AND LOCATION
FORMATS
MAP DATUMS
A datum is a mathematical model of the Earth that approximates the shape of
the Earth and enables calculations to be carried out in a consistent and accurate
manner. The datum is physically represented by a framework of ground monuments
(such as trig. stations) whose locations have been accurately measured and
calculated on this reference surface. Lines of latitude and longitude on a chart are
referenced to a specific map datum. Every chart has a map datum reference and
the G300 can be set to match most of those commonly used.
LOCATION FORMATS
Your current location can be viewed on the GPS in the form of coordinates.
Since different charts use different location formats, Garmin GPS units allow you
to choose the correct coordinate system for the type of chart you are using. The
most common format is latitude and longitude, which is used by all Garmin units.
You can change the location format to use with other coordinate systems.
Map Datum and Location Format selection can be performed on the Position
Setup Page.
Changing position settings:
1)
Press the MENU Key twice to display the Main Menu.
2)
Turn or move the FMS Joystick to highlight ‘System Setup...’ and press
the ENT Key.
3)
Turn or move the FMS Joystick to highlight ‘Position’ and press the
ENT Key.
4)
Move the FMS Joystick to highlight the desired field, and select the
desired option by turning the FMS Joystick.
5)
Press the FMS Joystick, the CLR Key, the EXIT Softkey or the MENU
Key to remove the menu.
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