I was in the pool for a while using a RIPE NCC gps synced pci card. It was fun, but machineroom dynamics made keeping a dome antenna attached was hard: they hate special cables, and roof access is a security and water nightmare.

A rubidium clock is pretty cheap these days anyway.

Now, I'm on Bert Huberts gps drift and availability thing with a raspberry pi measuring visibility and availability out my home office window. Much more fun.