Geotagger N3-c GPS Unit for Nikon Camera D600, D7000, D3200, D5100, D5000, D3100 and Coolpix P7700 Distance: 5 to1000m distance performance, furthermore 1600 yards for highly reflective target. The error is as low as +/- 1M. Speed: Easy to measure speed winthin 300KM/H. Flagpole Locking: Lightning separate the flagpole or other targets from busy littery background. Fog Mode: Do not worry the fog, the Fog Mode makes your hunting or golf without a hitch. Scanning measure: One-key to start measure 20 times continuously to display every distance scanned.