Natsoft VS Samsung S4 Race chrono

[shippy__]

Natsoft VS Samsung note 3 with Race chrono application


I wanted to see how accurate the mobile phone GPS lap timers are. So I decided to use a Note 3 that had a pretty eventful Anzac day...

I have used it previously on a practice day, really put together a few solid laps and looked down only to see it turned itself off or something silly.


My conclusion is they are very accurate, but unreliable. I wouldn't invest in a mobile phone GPS lap timer set up, but if you have a cracked unused phone laying around its better than nothing.

Here are the numbers



Natsoft..............
Note 3 Race Chrono

1:12.3790...............
1.1233
1:13.0600...............
1.13.14
Pit .........................Pit
1:07.6750...............
107.65
1:07.6040...............
107.63
1:08.2270...............
108.25
1:08.8140...............
108.84
1:06.9510...............
106.95
1:06.9770...............
106.99


1:11.5210...............
irregular accuracy
1:06.3830...............
106.38
1:06.2440...............
106.26
1:05.9940...............
106.00
1:05.5540...............
105.62
1:06.2060...............
106.14


1:11.6920...............
110.73
1:06.7180...............
106.75
1:05.4800...............
105.51
1:05.5160...............
106.21
1:07.6940...............
107.60



1:15.0260...............
No GPS accuracy
1:08.3580...............
No GPS accuracy
1:05.9020...............
No GPS accuracy
1:07.1250...............
No GPS accuracy
1:06.3580...............
No GPS accuracy
1:06.7570...............
No GPS accuracy


1:13.2740...............
No GPS accuracy
1:07.1890...............
No GPS accuracy
1:07.4740...............
No GPS accuracy
1:07.2980...............
No GPS accuracy
1:06.4650...............
No GPS accuracy
1:07.2800...............
No GPS accuracy

[Linden]

Don't forget there will be some difference (1/100s) due to the slightly different trigger points

[Mr.Ed]

Yep, mine shows similar differences and I put it down to different trigger points. I've compared it against timing equipment from St George meeting in EC and WP as well as the Bernie Hatton days last weekend and the results seem very consistent.

Whenever it fails it's usually down to me doing something wrong like burying the transponder too deep in the bike or forgeting to lock the phone before putting it in my pocket.

Also, using racechrono for Laptimes only is a waste of a lot of its potential...

[Marty]

GPS timing devices use a predictive timing algorithm to fill in the gaps between logged points, so even if the log rate is low it can still be very accurate providing that the lap marker/beacon is in a sensible place like halfway down a straight. If you have a marker in a funny spot and have a low log rate then you could get a bit of accuracy by moving the point.


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