I race autocross, and this app allows me to map the track while I walk it before racing. One issue that I found is that the first few points are always way off because gps hasn't yet stabilized. To fix this, I usually start the tracking, stop it and discard the track once gps is stabilized, and then start tracking again. Another suggestion to the developer is to omit the degree symbol in the output. I have to remove it in Excel before I can plot the data. Otherwise, it works great!
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Response from developer
Please update the app v2.7.12
Please use decimal format and export CSV file. If you have any problems / suggestion, please contact us peterhohsy.ios@gmail.com