I have a casio protrek
Try to reset the watch.But first be sure that you capable of doing this.
Reseting the watch procedure:
1)Remove the back cover.Be sure that you have the appropriate screwdriver.Keep the 4 screws safe, not to loose them.
2)On the chassis of the watch (metallic surface) somewhere there is a hole with AC (All Clear) written nearby.
3)Use one little thin retracted paper clip (not totally retracted).Insert the retracted end of the clip into the hole, gently, until it touches the end and with the upper part of the clip contact the chassis (metallic surface). Wait for 1-2 sec and remove the clip gently.The watch is now reset.All functions have been set to factory settings.
4)Put back in place and with caution the back cover, respecting right (up-down) positioning and taking care that the O-ring gasket is well in place,first.
5)Holding in place with one finger the back cover,screw back screws gently and without applying excessive force (delicate job) until you meet resistance, in the following order:
After setting the time/day/date etc try to calibrate compass both ways as you did before.
I hope this will solve your problem.
NOTE:Again,be absolutely sure that you are capable of doing this.
It is a bit delicate job.If not,you better bring the watch to an official CASIO service center.
on May 15, 2017