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Time Server
How to use GPS module for real-time location and PPS clock synchronization service
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GPS to RS-232/USB interface diagram. | Download Scientific Diagram
GPS-DO expansion board GPS input PPS and 10MHz output port USB PC | eBay
So you want a Stratum 1 NTP server...
z050 USB GPS Dongle with PPS
PPS over USB
Using the Sure Electronics GPS evaluation board for NTP
Millisecond accurate Chrony NTP with a USB GPS for $12 USD - Austin's Nerdy Things
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ICP DAS GPS-721 GPS Receiver and 1 DO, 1 PPS Output Module communicable Over RS-232 and RS-485.
