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Configuring Gps When You Find A Benchmark.


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It really does not matter what you do, your GPS elevation is generally not very accurate. A handheld GPS is usually within 20-50 ft. of true elevation sometimes it can be even closer, but just by luck. In other words use the elevation given on the NGS data sheet, if it is a vertical benchmark.




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Even if you are setting the altimeter (in a GPS which has an altimeter) it would probably make no difference. The altimeter will not be that accurate either -- but probably better than the GPS altitude (especially when you have recently set it at a know elevation, such as a benchmark).

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