Olympus TG-Tracker : What does this data stand for?
The Olympus TG-tracker has a built in compass, so it seems reasonable that $OLCMP is a compass reading. Try rotating the camera to see if the reading changes.

If you have App that works with this camera try comparing the readings from the App with the log data and try to tie them together.

I'm not convinced that $OLACC is acceleration data, the readings don't seem to make any sense when interpreted that way, and the user manual doesn't say that it logs acceleration data. But check against the App.

The one thing that seems missing from the log is the GPS data.