My Samsung Mini 3-Series seems to do a horrible job of logging the data. The boat jumps and stutters. When I look at the .csv data, most of the deltas between rows are 2 sec, but many are 0 sec and others range from 5 to 30 sec and more. I closed all other apps when recording the track, although I didn’t restart the phone. Have others seen this problem? The attached file shows the time deltas for 200 rows. This is for a 420 with the phone in the spi bag on a damp day.