Navman Fish 4200

[peo007]

Have a Navman Fish 4200, when starting it the menu is in English, farenheit, ft, mph. so you have to change the values ​​to Swedish, celsius, meters, knots, and save.

When you then turn it off and turn it on the next time, it's back to square one.

Have opened it and checked for backup battery, none.

Is it supposed to be like that or have I missed something?