Tow Tracker

I have started tinkering around with the idea of developing a Tow-tracking for clubs to use that would not interfere with operations yet still be able to provide an upgrade to having a dedicated logger try and confirm release altitudes.

My current thought is to have a cell phone app that talks to bluetooth sensors mounted in the towplanes. The Wing runner/logger would enter in the pilot/glider info, then transmit the data to the tow. The towplane unit would take that log file and record the tow height (assuming max altitude) and save it to the file, which would then be transmitted back to the logger when the tow lands, and the next pilot log is entered. The logger should be able to upload all the files at the end of the day, with accurate tow heights without asking the tow pilots to record it.

Thoughts? Potential Problems? Interested in helping? The objective of this would that it would be a free app for the community at large with the hardware designs published as well.

I understand there will be the standard cry of "we have always used a pen and paper and it worked just fine," but that isn't the intent of the question being posed..