First, in 1999 there were very, very few GPS receivers in civilian hands. While Magellan introduced the first handheld GPS receiver ... dashboard navigators by Garmin and Tom Tom became the ...

Combined with a GPS module and an Arduino with an SD card, the rig can keep track not only of how much water is below it, but exactly where the measurement point is. The whole thing is rigged up ...

At close: April 30 at 4:00 PM EDT ...

Product review details, this product has received, on average, 4.40 out of 5 star rating.