Further to James' post about trackers this weekend here's the link to what I've got one for.
http://maps.opentracking.co.uk/15yorkshire300.cfm
It's a 300Km ride with 6700m of ascent/descent.
A little background. It's an ITT (Individual Time Trial) which is basically a fancy way of saying do a long mountain bike ride on your own. The general rules are you can use any facility that is open to others; no mandatory kit nor restricted kit (except for motors!); no pre-booking of facilities. You can go off route to get restocked or whatever but must rejoin the route at the same place. What all this means for example is that if you get to a B&B and want a warm dry bed for the night then it's fine but you can't ring ahead and book it.
A bit more info here from the guy that's organised it - http://riderscyclecentre.com/?page_id=2568
It's the first one of these that I've done so other than a lot of hard work I don't know what to expect.