Using Global Positioning Systems
- Published: Sunday, 28 December 2014 11:27
- Written by Lance Hartley
- 1 crew
- 1:25000 topographic map
- Bega Map
Global Positioning Unit
The Global Positioning System is a network of satellites in orbit above the earth. A GPS unit is basically a radio receiver. The satellites transmit to the GPS unit which interpolates the signals into latitude and longitude which are displayed on the unit.
Typically signals from three satellites are needed to identify a specific position and a fourth to interpolate altitude. GPS units are accurate to within a 30 metres of your actual location. Although they can be used to very accurately determine your location and establish compass courses, don't rely on a GPS unit in place of solid knowledge of map and compass. Battery failure, damage to the GPS unit, or even leaving it behind at a rest stop could leave you lost if you don't have good map and compass skills. GPS units are particularly useful in locations where there a few landmarks to identify your location (for example fighting fires in the middle of Bournda National Park).
- To turn the unit on, long-press the Lightbulb key and keep pressing the Page key until the main page appears
- To turn the unit off, long-press the Lightbulb key.
- To set the backlight and shading short-press the Lightbulb key and then use the Light Bulb and Rocker key to make adjustments.
- Check the available battery charge in the Main Menu.
- Navigation through the units interfaces is accomplished by using the Enter and Quit keys, and the central Rocker key.
- Interface is set-up around pages and menus which are accessed by pressing the Menu and Page keys.