Thinking about buying a sat nav for the bike, 450 exc, lots of byeways and greenlaning in Wilts area plus rides in Wales. Open to thoughts about a reasonably priced system...my brother has a satmap 10 and other mates have some type of Garmin. Any pros and cons?

Well I've just fitted a KTM 37 litre top box which demands removal of the 990 SMT rack and grabrails that it came with. It gets replaced with a plate for the SMT which is bolted onto the same four bolts at the back (with rubbish hex bolts) with spacers which are about 40mm and 50mm. Then another...