Global Positioning System (GPS)
Where am I now?
September 2007
A GPS is now a common part of the 4WDriver's kit of tools. Their basic function is to give your current location - of itself, information of little value but combined with a map and/or the coordinates of where you want to go, it can become a very useful navigational aid. As with all tools in 4WDriving, do not become completely dependant on it - you must have an alternative method of navigation in case it fails.
What do you need to know about them and how they work?
These links will be useful:
How it really works:
Wikipedia - GPS: Simplified method of operation
Maps, Datums, Grids – see:
Geodesy & GPS
World Geodetic System 1984 (WGS84)
Geocentric Datum of Australia (GDA94)
Australian Geodetic Datum (AGD84)
Where to get maps:
Geosciences Australia Maps
Waypoints / Landmarks:
Wikipedia - Waypoint
Routes - linking Waypoints into a pre-determined plan for your trip - see your GPS manual
Tracks - your GPS recording of where you’ve been - see your GPS manual
Other links for selecting a GPS, software and other sources of information - there are lots of others out there as well:
Dave Patton - Canadian Information Systems
GPS Information Net
GPS Tracklog
GPS Vehicle Navigation in Australia
Oziexplorer GPS Mapping Software
Last updated 18 September 2007
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