Back in the 60s, we just buried the main stash in the garden, behind the house. Nothing fancy, just a large paint can. We did get busted once, but they only fou

Back in the 60s, we just buried the main stash in the garden, behind the house. Nothing fancy, just a large paint can. We did get busted once, but they only found a little of this and that. I've played some with geocaching, and it's amazingly hard to find something buried, with no data except GPS. Phones are useless for that. And they're also a security nightmare, being basically tracking devices. So you use a dedicated GPS device, which doesn't transmit. But even with them, you need to average for maybe 10-20 minutes to get WAAS-level accuracy. I like the IR retroreflector idea. And retractable! It'd be a little stationary robot. And for a cover story, have Pokémon Go installed.