Apologies if this has been answered before, I can't seem to find what I need though (might be the wrong search terms?).
In a nutshell, I have a datalogger I am building (328p-based) that I need to be able to locate and collect. I will know within a ~1/2-3/4-mile radius and with a fair degree of certainty as to the rough direction where it is, but not much more than that. It could be buried in the ground a few feet, stuck under a rock, sitting right out in the open, etc. I just need to be able to find it and gather it, I don't have to transmit any data back (it is logging to internal memory).
The size doesn't have to be tiny, but anything more than a couple cubic inches could be troublesome. It only needs to run for maybe an hour off of batteries (long enough to deploy and then go collect it).
Ideally I'd like something fairly ready-to-go that I can integrate into my device that is something roughly to a beacon. Think of spy movies where they can go find an object they put a tracker on (yea, I can't come up with a better example today...coffee time...).
The only half-solution I came up with was to put a GPS chip on-board and periodically transmit the coordinates. But I got hung up on a good transmission system (I do not want to go cellular). Ideally the solution would be something even simpler, but I'll listen to any ideas that will get me there!