Found a helpful thread by Reebs on how to access the service menu to look in more detail at the satellite settings by selecting Set from the screen and then pressing and holding the Menu button for 8 seconds. Tried this but it won't put me into the service menu, guess there must be a fault with the head unit, all other functions on the head unit seem to work okay. Case of swoping the head unit and then going from there I guess.
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