This article (found at SciTech Daily) tells about tiny autonomous fliers proposed for Mars.
Bees may also provide a solution for navigating on Mars, where there is no GPS network or magnetic field to tell one pole from another. Bees use a combination of polarization patterns in the sky, landmarks, and distance traveled to navigate.
Is satellite-assisted navigation unlikely for Mars? How many birds does it take? If the flier gets even one fix a day, it can correct gross errors in dead-reckoning.