I thought this would be a good one to the attention of anyone organising a charity ride.
UK based company Remote Asset Management are offering free GPS trackers to anyone organising a charity or endurance event.
Using a GPS system would be a good addition to a ride so that you can report back on your progress. If you are charity fund raising then this can make a great addition to your JustGiving page. Alternatively, if the ride is an endurance event then it can be a great way to get accurate results on your performance.
If this is of interest then contact details can be found on the Remote Asset Management charity page.