We're looking to upgrade from our antiquatated Trimble 4800 gps system to something more modern and I was wandering if anyone had suggestions. I am interested in either a Trimble or Tocon unit with a cellular modem but other than that I am kinda lost on what I really need. The primary use of the system will be surveys of infrastructure downstream of dams such as roadway crossings, FFE's, etc. in which I am primarily interested in the elevation.
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