There's treasure in them there fields!
Luckily, it has a homing beacon attached.
Unluckily, your tracker was cobbled together from chewing gum and string, and can only tell you distance, not direction... and it takes 30 seconds to recharge after each ping.
You'll need to criss-cross the fields, using your tracker to triangulate in on the treasure - good luck!
Note: this has only been tested on the Android "WhereYouGo" app - please get in touch if you run it on other platforms and run into issues.
Download the cartridge from here.