Originally Posted by
n5296s
- my nifty nixie-tube clock gets its time source from a $10 GPS dongle. It's IFR certification that's expensive.
I've been involved with static devices that use sub-$1 GPS chips. However experience shows that if you're using one of these you're best off averaging its claimed position over about a week (of not moving, obviously) before taking it seriously. (We did code in another check after a month, but this turned out not to be necessary, the position was pretty good after a week.)