Just wondering if someone can help.Having a nightmare with my SD Card Navigation system. Whenever I try and input a postcode, it will only go straight to the town and wont let me fill out the rest of the postcode.Issue is around the GU postcode. I need to type in GU23 XXX which is not even in Guildford. It just jumps straight to Guildford after I type in GU and wont let me input the rest of the postcode.Same happened with a TW postcode. Jumped straight to Twikenham when the postcode in question (that it wouldnt let me finish) was 10 miles away in Wraysbury near Windsor!Is there a way that you can overide the system and just type in a number?