Handheld GPS Guide
Handheld GPS navigation systems are commonly used for outdoor adventures, such as hiking, boating, fishing, camping, hunting, geocaching and mountain climbing. Some handheld units will also give basic directions in urban areas, but most do not have detailed road maps.
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Satellites
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Handheld GPS units use the United States global positioning system satellites to pinpoint your precise location. The unit must lock onto three satellite signals to find your latitude and longitude; a fourth satellite signal is required to add altitude to the location. A view of the sky is necessary to obtain signals.
Waypoints
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A waypoint is a point on Earth saved in your handheld GPS unit. Some waypoints come pre-loaded in the unit, but most are locations you have saved. For instance, save the location of your campsite before going hiking or mark a good fishing spot so you can return later.
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Electronic Compass
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Many handheld GPS units provide an electronic compass. The compass is only accurate if you are moving. When you stop, the compass no longer works correctly.
Sun And Moon Tables
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Most handheld GPS units provide information about sunrise, sunset and the phases of the moon for any day of the year. The information provided is specific to the location you enter.
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References
- Photo Credit gps navigator image by Galyna Andrushko from Fotolia.com
