GPS is fun and Street Atlas 2005 rocks!!
03-20-05, 09:05 PM
#27
Bob
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My take on the whole thing is that You ain't really paying attention.
03-21-05, 07:45 AM
#28
Bob
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Originally Posted by CdCf
Sorry if you got the impression that I own a GPS unit.
I never have and I very much doubt I will.
Frankly, outside of marine and aviation applications, there is very little need for GPS in any form.
A good map for a few bucks, along with a compass, is all you need to navigate by foot.
Save your hundreds or thousands of dollars for bike parts instead!
I do, however, like to keep up with new stuff, so I've read up on the subject.
I've read a fair number of long-term stationary tests over the years, and they all give pretty much the same picture. An accuracy of roughly 10 metres for +95% of the time.
I never have and I very much doubt I will.
Frankly, outside of marine and aviation applications, there is very little need for GPS in any form.
A good map for a few bucks, along with a compass, is all you need to navigate by foot.
Save your hundreds or thousands of dollars for bike parts instead!
I do, however, like to keep up with new stuff, so I've read up on the subject.
I've read a fair number of long-term stationary tests over the years, and they all give pretty much the same picture. An accuracy of roughly 10 metres for +95% of the time.
03-21-05, 08:06 AM
#29
Videre non videri
Join Date: Sep 2004
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This has nothing to do with the units themselves.
The accuracy is limited by the entire GPS system.
If you think your GPS unit is more accurate than that, then fine, but your belief doesn't make it a fact.
But I wouldn't say an error of 5-6 m is much, in any case.
It's a lot if you've bought the myth of inch precision, but not bad if you think about it.
Your average road is wider than the error, so it's good enough for road navigation.
The accuracy is limited by the entire GPS system.
If you think your GPS unit is more accurate than that, then fine, but your belief doesn't make it a fact.
But I wouldn't say an error of 5-6 m is much, in any case.
It's a lot if you've bought the myth of inch precision, but not bad if you think about it.
Your average road is wider than the error, so it's good enough for road navigation.
03-22-05, 08:50 AM
#30
Senior Member
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If you go to www.geopainting.com, the guy has a functional shareware program that lets you make home-brew garmin-compatible mps from tracklogs, plotting on air photos, or by importing ArcView GIS format data (a widely used vector GIS format).
This has allowed me to use imported arcview data to put uselessly over-detailed things like building outlines, fences, and 50-cm contours on the maps in my Garmin etrex unit. So much for all that on-board memory I though that I had.
The program is pretty intuitive and graphics-based, but you may need some knowledge of GIS software to make maps that are functional.
This has allowed me to use imported arcview data to put uselessly over-detailed things like building outlines, fences, and 50-cm contours on the maps in my Garmin etrex unit. So much for all that on-board memory I though that I had.
The program is pretty intuitive and graphics-based, but you may need some knowledge of GIS software to make maps that are functional.
04-04-05, 11:01 AM
#31
pluralis majestatis
Join Date: Feb 2004
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Originally Posted by CdCf
This has nothing to do with the units themselves.
The accuracy is limited by the entire GPS system.
If you think your GPS unit is more accurate than that, then fine, but your belief doesn't make it a fact.
But I wouldn't say an error of 5-6 m is much, in any case.
It's a lot if you've bought the myth of inch precision, but not bad if you think about it.
Your average road is wider than the error, so it's good enough for road navigation.
The accuracy is limited by the entire GPS system.
If you think your GPS unit is more accurate than that, then fine, but your belief doesn't make it a fact.
But I wouldn't say an error of 5-6 m is much, in any case.
It's a lot if you've bought the myth of inch precision, but not bad if you think about it.
Your average road is wider than the error, so it's good enough for road navigation.
that + dgps handheld rover = winner
inch accuracy (not just precision) is possible.. im trying to get a job this summer building a plate boundary observatory relying on gps tech
