Thanks all, but I'm STILL having problems... Bought an aftermarket aerial from the good folks at A8parts which turned out to be the wrong size, have a new one now (Ta muchly!) and it still doesn't want to work... Plugged it directly into the back of the Nav+ unit and have variously dangled the antenna on the roof, outside the car and in the windscreen, and still doesn't pick up satellites.
Since I've plugged it in, the available satellites display has gone from around 25/27 to 30, however at best it only shows 1 satellite as "receiving"- Which obviously won't work..
Help! Should I plug it in at the boot instead?
PS- It's actually a RNS-C unit
