Digital Geochron
My Dad (K2GC) and I were looking around for a greyline map to use in the shack so we could see what time it was around the world and see we could see what HF propagation was avalibale. So we got to looking online and founf this really cool thing called a Geochron, a mechanical greyline clock. there was one catch though... said greyline clock had a price tag of about $3000... not in the budget. So we started looking for a cheaper way to do the same basic concept.... A raspberry PI.