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What I want is that the coordinates can be read off the phone screen. If they
can be exported to a file along with a time stamp, that would be great but
taking down the info with pencil and paper is not a problem if necessary.
I'm thinking if you take two readings within a few minutes at the same general
site, let's say 200 ft. apart, that the difference between them will still be
close to the right answer in terms of bearing and distance since the correction
factor at each point would cancel out when subtracting one result from the
other.
Of course if the correction factors jump around in the course of minutes, all
bets are off.
Agreed that the absolute accuracy isn't going to be spot on. You could take
readings at a known location to figure out what the error calculation would be,
at least on a short term basis.
If you are building a travel spreadsheet, location versus time, in most cases
you know your route. If the plotted out data shows that you are consistently
50 ft. south of the highway you knew you were on, you can mathematically weed
out that kind of error.
Mark Connelly, WA1ION
South Yarmouth, MA
<<
Mark -
I presume you want GPS to allow calculation of distances since bearing is
easily done with compass apps.
You didn't mention exactly what you are trying to do but I thought I would
mention that GPS accuracy at its best is not good enough for antenna
construction and installation.
And on -not-the-best days, you can't expect an absolute accuracy of anything
better than maybe 20 feet. Half that on good days.
If you're trying to measure wire length, I'm afraid a Harbor Freight 100 or 300
foot tape measure is still the way to go.
Chuck
>>
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