On Wed, Nov 28, 2001 at 12:06:20PM +1100, Terry Collins wrote: > 1) GPS receivers are not accurate enough.
Depends on what you're trying to do. Now that SA has been turned off, GPS is generally accurate to within a few metres (and generally always less than 10 metres) for 2D readings. Altitude is generally nowhere near as accurate, although at times it can supprise you... > 3) GPS receivers have a coverage like mobile phones = big holes. Actually, they have a coverage almost exactly the opposite of mobile phones - they work perfectly in the country, and not so well in cities :) I generally find i have no problems unless I go into the CBD, where the buildings block the signal. Most other places around Sydney seem to work well enough. > 4) GPS receivers do not have the capacity (waypoints) = required laptop. True, but Palm pilots do! Record the data on the GPS and dump it to the Palm every few hours. > Scott Howard might light to post the URL's of the rides he has done > where he has laid GPS data over this style of map. Hmm.. that'd be my cue I suppose! http://milliways.doc.net.au/2001/csydney/map.gif (The pink line from North Sydney to Parramatta - I need to redo it in a diff colour sometime) http://milliways.doc.net.au/bike/maps/ride050300.gif http://milliways.doc.net.au/bike/maps/ride260200.gif The maps are taken from either SydWay or Whereis's websites, and are generally multiple maps stuck together. The top one is after SA was turned off, the bottom two are before (and thus the accuracy isn't as good). Generally I find that accuracy is fine on this scale map. If I do it to the street level then it varies between excellent (always getting the right side of the road, etc) and OK (wrong side of the road, cutting corners, etc). Scott. -- SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
