Setting altimeters with no radio
DR wrote:
On my 12 channel boat GPS I see a
HDOP of ~1m these days.
HDOP is unitless.
Good point. I'm sorry that I was being so loose. But you could descibe
the 1 sigma dilutuion of precision in terms of distance at your position
and time -right? I was actually amazed to see that my Ryatheon GPS put
my boat right in the center of the correct dock -implying 2m accuracy
(or better)!
Cheers MC
I have to think about it. Position accuracy is given by this generic
equation:
DOP x UERE x 2 = position accuracy (2 sigma or 95%) where UERE is the
combination of the space and user equipment error sources.
Ron Lee
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