Dear Doug and Roger,
You are both right to doubt claims for 0.1 arc-second precision
in azimuth using a hand-held GPS receiver but there is more to
be said before dismissing GPS outright.
Appropriately translated, 0.1 arcsec precision is equivalent
to a 2km baseline with the end points known to
Good morning folk,
I have been quietly following this strand with interest.
I use GPS constantly in my research, but because of the continental-scale of
my work, I don't have to worry too much about whether or not I am getting
metre-level precision. It doesn't really matter to me if the
