Ron Lee wrote:

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