NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS selective availiability 'switched off'
From: Rodney Myrvaagnes
Date: 2000 May 04, 23:50 EDT
From: Rodney Myrvaagnes
Date: 2000 May 04, 23:50 EDT
All points well taken except 3. Some of us cruise in places where the buoys are few but the pbstructions are quite permanent, like eastern Maine. There was no point in surveying one's own chart corrections before, but now a few dinghy trips may open small passages for the mother vessel at high tide. I still wouldn't bet my boat on a chart I hadn't verified, but I will get some satisfaction out of pinning some things down for myself. I expect to compare two GPS receivers with and without DBR corrections (plain vanilla CG beacons) this season and see if I can develop confidence. I will also look at the web site Prof Langley posted, if it doesn't crash the IE on this portable. I can look at it tomorrow with netscape if it does. On Thu, 4 May 2000 23:15:31 +0100, Clive Sutherland wrote: > >POINT 3 >What is the point of knowing your position in Lat and Long more >precisely >than the quality of the Chart or Map you are using. Sandbanks, mudflats >and estuary bars as well as navigation buoys are known to move about. >POINT 4 Rodney Myrvaagnes J36 Gjo/a Senior Editor Electronic Products My oyster knife is Y2K compliant