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On Fri, 04 Apr 2014 11:26:41 +0100, Eion MacDonald <eionmac@xxxxxxxxxxxxxx> wrote: > > >On 03/04/2014 23:06, Julian Hall wrote: >> With a SatNav it doesn't matter if you can't see anything as long as >> you can see /it/. > >AND you do not move except very cautiously. SatNavs for civilian use >are not accurate within 6 feet (deliberately). So easy to walk over an >edge. USA military accuracy is 10cm! As Gordon says, this is largely out of date now. There are a bunch of projects about to produce centimetre level GPS receivers for regular folks to buy. Here's one: https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver?ref=live Still not my idea of cheap at $900 but is way cheaper than what is available now. Kevin -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq