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If price is truly no object, get GLONASS capable unit for speed and accuracy. Check that reception is available wherever you are.
We have two circa 2008 handheld Garmins at the office. Old school technology is still capable of sub 5 meter xy accuracy, sometime 3 meter. We send them out with n00bs and when I take the Trimble R10 with leica dot cors subscription to verify monitoring wells or reference points, it checks out.
Z data notwithstanding. Elevation accuracy is always less than xy, no matter the unit or technology.
