Google Map with Topographic Map, State Plane Coordinate Systems, UTMs and Principal Meridian overlays.
Show GPS position, Search for locations or positions by latitude/longitude.
View NGS points, NGS data sheets and NGS Vertcon data
See www.surveying.org for sample
May share your location
Apps can determine your current location and send it
approximate (network-based) location, precise (GPS) location
full network access
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