RE: [Paddlewise] FW: Download to Garmin 12X

The problem with making accurate maps is that the world is not flat, and
actually not a sphere either. The agreed conventions on how this distortion
is dealt with and/or the differences in survey methods introduces known
errors corrected with map datums (A simplification).

A missing island may have in fact been missing! The island may have been
surveyed in the 20s and been washed away or otherwise moved.

cya
		-----Original Message-----
		From:	owner-paddlewise_at_lists.intelenet.net
[mailto:owner-paddlewise_at_lists.intelenet.net] On Behalf Of Robert Woodard
		Sent:	Friday, May 28, 1999 4:34 PM
		To:	Bob Denton; Chuck Holst; 'Paddlewise'
		Subject:	RE: [Paddlewise] FW: Download to Garmin 12X


		> When they were searching for the A6 that flew into the
Rockies, SA was
		> turned off. I marked my position on the beach, then a few
hours later I
		> decided to paddle in "on instruments" and followed the GPS
to the beach. I
		> landed on my footprints. That was with a 12XL. .12 miles
is 633 feet. Way
		> too much of an error and I'd be calling Garmin if I were
you.

		I posted a trip report a while back that mentioned we never
found the small
		Island in the middle of the river we were looking for.
Someone pointed out
		to me that the advent of cheap GPS receivers were uncovering
a lot of errors
		in maps.

		It would seem with the images I've seen on the internet of
topo pictures
		from satellites that very accurate topo maps would be fairly
simple.

		Woody


	
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