Garmin Zumo 550 sat nav £545 (£384 on MCN Shop)
Miles covered/time: 4200/three months
What's good? It's easy to use, sturdy, waterproof and gets you where you want to go, which is everything you need from a sat nav.
I keep it in the top of my tankbag and not hardwire in and fix it to the bike. I don't have it on all the time as it takes away some of the adventure of a riding holiday.
I prefer to remember place names and follow road signs instead, unless I get really stuck. Using it with gloves on is a piece of cake, even through the clear plastic of my tankbag.
The battery lasts a good five or six hours, the screen is big, clear and easy to understand at a glance.
It comes with a universal mounting kit which fixes on to the clutch lever mounting, so it will also fit sports bikes.
What's not? There's nothing wrong with the sat nav, but if you use it to find a destination via minor roads, especially France, it takes you up gravelly farm tracks and roads even a map maker wouldn't bother with.
It's best to use a map if you want to find twisty roads.