Chris
I noted you comments about the GPS. I use a Garmin 12XL (and other brands
have similar functions), but it uses both Lat & Long or UTM (and a host of
other grids), and you can set it to a host of datums - including the
Australian Geodetic Datum 1966 on which nearly all the AUSLIG maps are
based. I have only used it on land, and at no time have I found any
waypoints set to be greater than 200 meters out. Most times the waypoints
are within 50 meters of map position. This is within the parameters of the
US DoD Selective Availability. On land, 200 meters is not a problem,
neither is it a problem navigating on water in daytime. It should not
supplement a map and compass, but it can give quick accurate (to within 200
meters) positions in areas where there are no landmarks (eg heavy scrub or
horizon to horizon plains.
I already use it whilst doing the Birds of Prey Survey sheets, and it makes
zone changes easy - especially on back country roads and tracks.
Cheers
Dave Churches
David & Judy Churches http://www.pcug.org.au/~davec
33 Pohlman St
LATHAM ACT 2615
Australia Fax: 61 2 6255 2640
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