Earlier this year, the 2.000.000th cache has been published which requires some serious monitoring.
Therefore an observation lab has been developed to help doing this job.
They should be in orbit soon.
Each observatory can be identified (via a serial number) and is trackable.
They have lookthrough colorwindows and night-illumination.
Size: 50 mm diameter, around 20 mm thick
Spinning 'gravitation generator'.
Trackable at geocaching.com with its own icon