Ski Tracking App Accuracy or Lack thereof
I'm aware of the general inaccuracies in GPS which has many causes, such as strength of signal, type of receiver & programming, etc, etc...which can lead to sizable errors in these tracking apps. Then there is the app program itself which are not all created equal.
This week I skied side by side with someone with close to the same equipment and app and the difference in numbers is surprising. 1878 foot difference in vertical. One phone is a iPhone 5s with Ski Tracks by Core Coders V1.6.3 the second is an iPhone 6 with Ski Tracks Lite by Core Coders V1.6.3.
The numbers are all over the place. We rode the West lift 3 times & the Rocket 20, so if the Rockets reported vertical of 875 *20=17500 minimum, but one phone reports 17063 total with 882 delta. The other sounds more correct at 18941 total but then it has a 1034 delta for an 875 hill.
And I've read online that the speed numbers are the most inaccurate part of these GPS apps.
Also, if you happen to have this particular app be aware that it will not count runs under 280 ft.
From their site:
"The reason Ski Tracks may not reporting the run count correctly is that the elevation of your resort is too small to be registered as run. If the run and lifts are less than 280ft/90m this can cause the current algorithm issues with regards to counting runs and lifts.
To fix this issue we are doing a number of new things:
- An improved lift detection algorithm.
- Improved GPS detection for smaller mountains.
- Lift database to find lifts and name them.
- Track editing to add lifts in.
Any existing tracks will automatically be updated and the run count re-calculated. All of these new features will be made available soon in a future version of Ski Tracks."