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Search: Posts Made By: oplopanax
Forum: Maps, GPS, Orienteering   03-12-2014, 03:45 PM
Replies: 20
Views: 2,736
Posted By oplopanax
Most UAV people are making claims based on...

Most UAV people are making claims based on consumer grade hardware.
Any survey grade GPS is going to be much more accurate.
It would be fun to see the error plot from such a device if you would...
Forum: Maps, GPS, Orienteering   03-12-2014, 09:53 AM
Replies: 20
Views: 2,736
Posted By oplopanax
People think the devices are more accurate than...

People think the devices are more accurate than they are. 99% of the GPS units I've used report the 50% confidence interval, which is misleading. This project lets you compare the precision across...
Forum: Maps, GPS, Orienteering   03-11-2014, 10:02 AM
Replies: 20
Views: 2,736
Posted By oplopanax
@magnetite that's a very good point. In my...

@magnetite that's a very good point.

In my experiment I used my front porch as it was raining a little, and I live in ValleyCliffe, so the chief and Slhanay might be responsible for certain...
Forum: Maps, GPS, Orienteering   03-10-2014, 11:24 PM
Replies: 20
Views: 2,736
Posted By oplopanax
The "selected availability" was turned off years...

The "selected availability" was turned off years ago.
What you are seeing is the actual variability due to atmospheric conditions, signal bounces, and other factors.

In fact our recent solar...
Forum: Maps, GPS, Orienteering   03-10-2014, 11:22 PM
Replies: 20
Views: 2,736
Posted By oplopanax
It's not for SAR use. You're entirely right...

It's not for SAR use.

You're entirely right that phones in particular (both Android and iPhone) use various techniques for rough location including MAC addresses, ip geolocation and cell towers....
Forum: Maps, GPS, Orienteering   03-10-2014, 10:41 AM
Replies: 20
Views: 2,736
Posted By oplopanax
GPS Accuracy community project

I did an experiment a year or so ago where I compared the error in a Gamin handheld GPS unit to my Samsung Galaxy Nexus smart phone. I discovered that the Garmin is roughly twice as accurate (or more...
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