Following up on the accuracy problems for some time now. In the past weeks I used my way to and from work as a test track (consists of walking and local train ride through the city...high buildings, low buildings...quite a mixed field).
I tried beta versions from 2.86 on.
By far the worst tracks were produced by the recent firmware versions (2.94 and 2.95), which use the same gps-firmware....Lot of drift....lot of totally "drunken" tracks.... similar results to the track shown above sometimes......sometimes good results as well but usually not the kind of accuracy I would rely on...
Well, what I did yesterday is revert to 2.93 and again back to 2.95 [let the device boot up in between of course] to have the almanac cleared, to get a "fresh" satellite fix. Turned the gps on today and gave it some time to get a lock on a reasonable number of satellites (without moving....i found this to be important). Then I had a round with my bike....and the same way back....also some distance on foot to see how the device behaves with slower speed.
And tracks today looked wonderfully smooth when riding the bike (no reasonable difference between in and out tracks as well, could even figure out which side of the road I was driving on). And the "on foot" track looked MUCH MUCH better when compared to the previous days!!
This of course needs further testing, maybe someone else has similar experiences or would like to give it a try...
Maybe this hotfix feature is not that good after all....if my experience can be verified then I suggest Garmin to implement an option to clear all the previously collected satellite data or to give the user the choice to switch off hotfix alltogether.
Some screenshots:
Picture shows tracks done with different firmware versions, walking....inner city 5 story buildings+high church nearby...
pink: firmware 2.93.....ok
cyan: firmware 2.94.....bad
blue: firmware 2.95 before getting a "fresh" lock (see above)....bad
green: firmware 2.95 after getting a "fresh" lock (see above)....just walked up the street and back again...looks ok, similar to 2.93
Picture shows tracks done today with firmware 2.95 after getting a "fresh" sat lock.
Biking to work in the morning, back in the afternoon....tracks look perfect (at least for me)
Picture shows tracks done today with firmware 2.95 after getting a "fresh" sat lock.
yellow:bike, green: on foot.....When tracks indicate different sides of the street it shows where i actually were
Ok that's it for now, curious how the story develops....