I'm doing an ITT with my son a couple of weeks after the race starts as he needs to finish his college term.
I've got a Garmin Touring plus which I'll be charging off a SP dynamo hub, I was wondering what mapping people use? I've tried searching the forum, but can't find the answer. There seems to be a bewildering array of maps on offer you can put on the device and I don't want to buy the wrong thing.