Casio Pro Trek PRT-1GP GPS Digital Watch
One of the biggest issues with the earliest attempts to make watches smart was that the devices ended up being monstrous on the wrist with the added electronic functionality, and no wearable in history is a better example of that than the Casio Pro Trek PRT-1GP. Released in 1999, it was the first watch to include built-in GPS functionality, and while it could display raw positional data in latitude and longitude, it also worked as a sort of smart digital compass guiding the wearer back to a specific location using directional indicators and distance measurements. It didn’t display maps, but on the wrist of a seasoned hiker it was a legitimately useful tool that somehow managed to muster a full year of battery life. (With limited GPS use, of course.)
