Hi Chaps .I bought a second hand Nav 5 for my GSA 1250. It works but the toggle wheel does nothing . AmI missing something ? The wheel works for the menu on the bike but does nowt for the Nav 5 . It says on the TFT start Apps , but hell I don't know where . I read the on line manual but there is nothing about the toggle wheel . Am I a complete numpty . My old 4 uses to have some wheel activity but this one no. Is there something I have to do to enable it ? Thanks in advance