In recent years almost everyone has been using some sort of a digital device to send info "back home" from the bivy. Everyone on this site can attest to the benefits of that. Most folks are tech savy enough to handle something like that. Having a choice of using an app on their crackberry or shyPhone to highlight their books and add exclamation marks may well be welcomed by some folks.
The biggest challenge would be coming up with the device and making it good enough for the rigors of rally and desert racing. I truly believe that such a gadget can be developed with all the material and tech available to us. All of the safety aspects that Hog just mentioned would be huge pluses and you could make an argument life saving propositions.
I mean it is all really good food for thought.
The last paragraph in Hogs post pretty much sums it up.
An aid which if developed properly could be come a lot more.
cost is a big thing anywhere but a good product will usually be worth the price
btw thanks for taking the time to read my loooong winded posts
I have some time to type while waiting for things to RIP on my printer hehe (oh paper)