That’s a solid idea. A tiny MCU with a low‑power sleep mode and a micro‑solar panel could keep it running on a few hours of sun. For navigation, you could combine a simple compass, a few magnetometer readings, and a visual pattern detector that flags landmarks—maybe a distinctive rock or a flag. The trick is keeping the image sensor tiny and the processing lean. If you can make the whole thing under a gram and it runs on a single AA battery, explorers would love having a “dead‑eye” fallback that won’t drain their main GPS pack. Just watch the power budget and keep the code lean—every milliwatt counts.