How to Understand GPS Devices
Global positioning system (GPS) units provide an easy way to navigate whether it be on foot, road or on the water. GPS devices will vary in the features they offer, depending upon the intended use. Geocaching-friendly units, for example, will provide geocache information in addition to navigational data. Geocaching is an electronic scavenger hunt that uses GPS to find pre-selected points or geocaches. Basic navigational features will exist with all units. Understanding these features will help you get the most out of your GPS unit.
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Instructions
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Begin with examining the external features of the GPS unit. Some devices may have one-touch controls on the face or side, especially older units and those without a touch screen. Become familiar with their location as well as where to load batteries.
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Determine if your GPS unit has any preloaded maps. These maps will reside within the device's internal memory. The owner's manual will contain this information. Otherwise, map data may be uploaded into the device from map software sold by the manufacturer or online. Follow the software's instructions for uploading the maps.
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Look over the main screen after turning the unit on. It may take the device a few minutes to obtain satellite signals. Most GPS units will display some indicator of the signal strength or dilution of precision (DOP). The DOP measures how accurate the location data is based on the geometry of your position and the satellites.
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Set a waypoint using the unit's menu at your present location. A waypoint is simply a user-set point of reference. Waypoints may be used to mark a starting location or points of interest encountered while navigating. Add a description and symbol for easy reference.
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Select the waypoint using the GPS unit's menu or touchscreen. The screen will show the information that you entered as well as the coordinates of the waypoint. Exit from this screen.
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Try navigating to another point to get an understanding of how the device works. Most units will have a "Find" feature that allows you to select your destination. Depending upon the device, data may include cities, geographic points or highway exits.
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Use the GPS unit's electronic compass to determine your path. Bear in mind that a GPS unit for trail use navigates using the shortest distance, as the crow flies. It will not navigate around impassable structures such as streams or wetlands.
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Follow the electronic compass until you reach your destination. The electronic compass display can present other useful information such as the distance to the point, bearing, and estimated time of arrival (ETA) based on your current speed.
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Stop navigation when you have reached the point. While GPS units can be extremely accurate, other external factors such as topography and dense tree cover can interfere with signal reception. Use common sense when using the device.
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Tips & Warnings
Allow the GPS device to "catch up" with you when you first begin navigating to avoid false electronic compass reading. Some higher end units will allow you to calibrate the compass's sensitivity to your movement.
A GPS unit is not a replacement for a paper map and compass. Always carry backup map information in case of device failure or poor satellite signal strength.
