Basic Functions
What are the basic functions on a GPS device and how do they work?
Base maps
Most receivers come with a basemap pre-installed and the option to add maps extra maps. The map page shows your position on the base map along with any relevant data related to your trip along the top of the page. The map setup page gives you options to change the map orientation to suit your needs. The Below option allows you to set a level at which the display will default to the orientation settings. Auto zoom lets you see a full route from start to finish on a single screen, and detail sets the amount of information displayed on the map. Lock on Road is a very useful function that locks onto the nearest available road.
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Compass
Most GPS receivers now include a compass. The compass can be a very useful tool, particularly the latest electronic compass releases, but will require calibration prior to use. The exact method of calibration depends on the specific model, with instructions in the relevant manual, but in the majority of cases this comprises of holding the receiver horizontally and making one or more full revolutions on the spot. Once calibrated the compass is used to display required headings between navigation points, and the direction of travel at the time. Older models can only give a heading when you are moving at a minimum of 2Kmph, but electronic compasses in newer models can give an accurate direction and bearing whilst stationary.
The Compass Page uses a rotating ring to indicate the direction you are heading. The compass can sometimes be set to automatically include the adjustment from magnetic to grid north, depending on the model.
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Barometer or altimeter
Whilst 4 good satellite fixes can give an indication of altitude barometric altimeters are used to give a more accurate reading. As with the compass, the barometric altimeter requires calibration. Usually this involves setting the device at a know altitude or barometric pressure. It is important to realise that even the latest GPS barometric altimeters only give an approximation of altitude and are not reliable to the same degree of accuracy as your map position. Altimeters should also be reset regularly as they can be affected by rapid barometric changes.
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Trip Computer
GPS receivers are capable of keeping a record of your journey. On Garmin receivers the data is available through the Trip Computer screen, and on Magellan receivers the information is contained within the GPS Position page. The data collected for the Trip Computer is cumulative, and should be reset at the start of any new trip. The choice of which data is shown depends on individual models but will include an Odometer to record overall distance travelled, Time taken, Max/Average Speed and position.
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GPS Basics
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Getting Started
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GPS Buyer's Guide
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Using Your GPS
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GPS and Your PC
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