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This currently utilizes the String class which has some known issues that may contribute to Arduino crashes/freezing/restarts. We intend to replace this by Spring 2018. Particularly, the String class is used to cast floats and write them to the SD card with fewer decimal places.

Ascent/Descent rates occasionally calculate an incorrect value resulting in extreme high or extreme low values logged to the SD card log file. Likely a calculation error that just hasn't been explored yet.

This currently utilizes the NewTone library to control the Piezo speaker/alarm. This library utilizes Timer 1 on the Arduino which may be conflicting with our other timer operations that also utilize the same timer for APRS and/or SD card writes. APRS operations may also be conflicting with SD card operations. Need to investigate this for resolution.

As far as I'm aware:

NewTone = Timer 1
APRS = Timer 2
SD Card = SPI (??) using digital pins 10, 11, 12 & 13

Not sure how the SD card is running off of pins 10, 11, 12 & 13 via Arduino Mega. Seems like this shouldn't work, but somehow I got it to work and I don't remember how. Software SPI? Maybe Magic? Who knows....?

The TinyGPS++ library that this utilizes does not currently take advantage of any GPS power saving methods. It would be a nice enhancement.