GPS-Sport ForenRun.GPS SoftwareInaccurate distance
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robert 09.05.2008 15:15:47 UTC



You can take a look at the "Dilution of Position (DOP)" on the GPS Status screen. If that value is below 4, the signal is usually a strong good :-)

See http://en.wikipedia.org/wiki/Dilution_of_precision_%28GPS%29
traciottawa 05.05.2008 01:25:39 UTC



Thanks for the response. For the last couple of runs I've tried to give lots of time for the GPS to get a good fix before starting. Lately I'd been in the habit of just starting it right away, not even checking signal, and putting it in my belt :-)

Even if the signal says 'good' how do I know if its a strong or weak good?

Thanks.
robert 28.04.2008 14:21:26 UTC



Hi Traci

your Run.GPS recording
http://www.gps-sport.net/trainings/running_17607
shows that your GPS signal was very weak - your GPS track doesn't match the actual track you have been running at all.

You could do the following:
- leave your device lying in open space for some minutes before you start running (the GPS needs some time to get a good fix, even if it already shows status 'good')
- carry the device in a belt or arm band, do not hold it in your hands as this also influences GPS reception
- use QuickGPS if you have that installed on your ASUS (loads GPS positions from the internet)

I think your other recordings like this one
http://www.gps-sport.net/trainings/running_15468
look much better and should be accurate, right?

There's also luck involved ... depending on the weather conditions and the satellite constellation the quality can change.

Best regards

Robert
traciottawa 25.04.2008 17:32:13 UTC

Inaccurate distance

I've noticed several times where my distance is very inaccurate after a run. I'll compare my RunGPS distance with Garmin Forerunner values of fellow runners. I'm wondering how to track down where the inaccuracies lie, for a few of the runs it was during hill interval training. So maybe that has to do with the smoothing buffer not being set to a proper value?

Here's last nights run where RunGPS computed I ran 15.7K -- and the route it shows isn't even accurate:
http://www.gps-sport.net/trainings/running_17607

Here's what we really did. First we ran to the street where we're doing our 9 hill repeats (this shows the run there and back) which is approx 2.53K:
http://www.mapmyrun.com/run/canada/on/ottawa/174532223

Then we did the hill nine times. One hill repeat is approx .5K:
http://www.mapmyrun.com/run/united-states/on/ottawa/832112349

So in total RunGPS should have computed a distance of about 7K.

I just upgraded to release 2.2.2 build 965.

My smoothing buffer is set to: 50s.

I'm using an Asus P527.

Thanks for any help,
Traci
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