Ah, too bad! A loss for you and a lesson for all of us that gadgets do fail. Map and compass are absolutely essential.
Garmin has a good reputation for reliability and customer service. I expect they will make it good for you, but of course too late.
But maybe you should not give up too easily. Garmin sponsors a professional cycling team and is very conscious of their image. I'd contact them (http://www.garmin.com/us/support/contact
) with your tale of woe and see if they would help a visitor to our country by arranging with one of their dealers (http://www8.garmin.com/dealers/
) to exchange your unit and set of maps when you pass through. I doubt they would insist on proof of purchase, but is there someone at home who could fax a copy or attach a photocopy to an email if necessary?
I suggest this because they once helped me in a similar situation. A 60C fell off my handlebar mount when I hit a big pothole in a dark tunnel at speed. After checking the front wheel and tire, I went back and found the Garmin had been run over. I bought a replacement, called support with my story, and they gave me a new activation code so I could load my maps into the replacement. No questions asked, and they refused my offer to mail the remains of the old unit. All in one phone call!
Other than that, how is the TA ride going?