iBoattrack is a fantastic operation and provides a tremendous service.  You will be given a tracking device (pictured right) that you will place almost anywhere on the deck of your boat using the supplied velcro strips, or secure it any way that you would like -- but be careful, a deposit is required and the units must be returned after you get back from the rally.  The device is only 6" x 9" x 3/4"!!!  The system updates your position approximately every other hour.  Friends and family back home can track your progress on the Internet with the supplied login and password, which is not only fun, but helps to relieve stress and anxiety about whether you are OK.  Check out iBoattrack's website using the link above.