[time-nuts] GPS USB dongle for time server

[Mark Sims]

It's not exactly a USB dongle,  but if you have a Thunderbolt,  Lady Heather has a time sync command that sets the system clock to Tbolt time.  You can have it set the clock periodically or whenever the system clock diverges from Tbolt time by a specified amount (including 0 milliseconds).  You can also specify the offset delay from the Tbolt time message.  I get under 50 milliseconds offset without having to specify the message delay (but am using a hardware serial port, not a USB converter).