Ron, I'm afraid I'm more likely to have a GPS than a short wave radio, and I don't have a GPS
I have to admit, I'm a little confused at how a GPS can be considerred an accurate time device, with 2+ second delay between land -> sat -> land, surely either:
1) The GPS may be at least 2 seconds out of time
or
2) They use algorithms to compute the delay and allow for that in the reported time. In which case there's surely still room for error there.
Anyway, completely off topic!