Pro trek 3500 compass only going up 300 degrees. Doesn't reach 360 north???

Sounds like there is a magnetic field interfering with your compass. Something close to the compass is deflecting the needle, so look for the source close to the compass location.

To fix this, hold down the A button for 4 seconds. this allows you to recalibrate the home position of the second hand. My secondo hand was posting exactly 90 degrees west in compass mode, and this home position recalibration fixed it 100 percent.

Low battery can cause this type of fault! Make sure after changing the battery to do the all reset inside of the watch. If this does not work get in contact with Timex for how to have their watch sent for service.

As a pure shot in the dark, are you sure that you calibrated it so that it was pointing to the north when it should be and not to south?

If it was pointing south instead of north, then East and West would be reversed.

Sounds a bit daft but better than the directions of east and west changing?

Check your calibration perhaps?

I would contact Suunto with that issue.
You can reach them at :

http://www.suuntowatches.com/custserv/custserv.jsp?pageName=manuals_guides

This can be caused bij some magnet near the watch (a weak magnet is enough to influence the compass reading on the watch).

I had the same issue. I found that if you re-calibrate the compass the same way you did the first time, then it will act properly. I've had to do this a couple of times and it works.

http://pathfinder.casio.com/support/manual/

find your watch and use the manual. if there is no solution then take it in for repair. any Casio retailer should have repair center information.

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Cmpass (COM)
The integrated compass tells you the direction (e.g.SSW for south­southwest) as well as the number of degrees. To determine a direc­tion,hold the watch horizontally with the 12 o'clock position poin­ting in thedirection you want to know.
General information about the compass
The compass always points to the magnetic north pole.Maps are always drawn in alignment with the geographic north pole (verticallyupwards at 90 ). The declination angle denotes the deviation between themagnetic north pole and the geographic north pole. This deviation depends onwhere you are located. To obtain exact results, the declination angle must beentered into the compass.Remember to change the angle when travelling abroad.Within the UKthere is no need to change the angle because deviati­ons are only slight.Overleaf you will find a table showing the declination angles for a number ofcities around the world.A fault has occurred if the display shows"ERR" while taking a direction or calibrating the compass. Thecompass must be re-calibrated (refer to section after next) .
Table of declination angles
Amsterdam 01 W Little Rock 03 E San Francisco 15E Atlanta 04 W Livingston, MT 14 E Seattle 19E Bombay 01 W Munich01 E Shanghai 05W Boston 16 W NewYork City 14 W Toronto 11W Calgary 18 W Orlando 05 W Vancouver 20W Chicago 03 W Oslo 02 W Warsaw 04E Denver 10 E Paris 02 W Washington DC 10W Jerusalem 03 E Prague 02 E London 03 W Rio de Janeiro 21 W

I changed the battery in my PRT 50 but Alt and Baro still not working the light and Compass however is??