Steve:
Nice. Looks like you used an off-the-shelf "project box".
Looking at it I see the GPS connection and what looks like a plug for the LED flasher, but I don't see any power connection. What voltage does it use and how are you getting power to it? Did you indeed make it so the lead to the LED flasher can be unplugged from the box (seems like a good thing to do)?
I know of a friend in VT who might be interested -- maybe. For a "trustworthy" unit (with a quality Arduino board), what would be a rough price -- the $80 you mentioned (plus shipping)? What would the user need to buy... the GPS antenna?, Micro-SD card (of what capacity)?
George