Feature: Add GPS signal details

[micahp2]

There have been a few times when my GPS has gone missing for hours at a time. I would like it if there was a way to graph the data from the GPS (e.g. fix/status, sats seen, lat/lon errors, etc) so that there was some way to know how reliable or not the GPS is in certain locations. As it is today, I would have to wait for the GPS to be offline for 4 hours before an email was sent to me telling me there is a problem.