Re: GPs and Amateur Surveying
- From: "earth" <bobfoster@xxxxxxxxxxxxxxx>
- Date: Thu, 1 Dec 2005 14:13:29 -0500
CM:
interesting question. the point positioning accuracy of a garmin etrex (12
channel reveiver) is stated as <15 m without DGPS; with DGPS the accuracy
is in the 1-3 m range depending on the type of DGPS (USCG vs WAAS). from my
experience with the garmin GPS II+, if I mark a waypoint and navigate back
to it, i can get within 20 m (+/-), based on the display relative to the
waypoint feature. and this is fairly repeatable from day to day or week to
week.
how about if you calculate a position and navigate to it (as opposed to
navigating back to a collected position)? i would expect it to be the same-
within the manufacturer's tolerance.
--bob
"C.M.German" <cmgerman@xxxxxxxxxxxx> wrote in message
news:Nf-dnVS20Y94shLeRVn-jQ@xxxxxxxxxxxxxxx
> Using a normal everyday plain vanilla handheld gps unit, how close can one
> expect to come to a corner. If one was to set a corner then take a
reading
> and mark the waypoint then return the next by following the GPS to the
> waypoint, just how close could one expect to get? I mean in actual
measured
> feet, not within sighting.
>
>
.
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