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Raspberry Pi 3b+ Usb Port Gps Module With L80-39 Gps Chip For Raspberry Pi 3 Model B+ Raspberry Pi Zero Free Shipping - Demo Board Accessories - AliExpress
Time Server
ICP DAS GPS-721 GPS Receiver and 1 DO, 1 PPS Output Module communicable Over RS-232 and RS-485.
USB GPS with PPS and pretty cheap too - Server operators - NTP Pool Project
Frontiers | Time Synchronization for Wireless Sensors Using Low-Cost GPS Module and Arduino
VK-162 USB GPS Dongle G-Mouse G7020 Channels U BX M8030 Chip For doogle Earth | eBay
z050 USB GPS Dongle with PPS
China Low Price Raspberry Pi GPS Module USB Port - Quotation - GNS COMPONENTS
How to use GPS module for real-time location and PPS clock synchronization service
GPS-DO expansion board GPS input PPS and 10MHz output port USB PC | eBay
Millisecond accurate Chrony NTP with a USB GPS for $12 USD - Austin's Nerdy Things
USB Level GPS Module + Antenna Integrated Module Receiver PPS Second Pulse Timing BS 506C|Cable Winder| - AliExpress
GPS-DO expansion board GPS input PPS and 10MHz output port USB PC | eBay
G-Mouse USB GPS Antenna VK162 Dongle Navigation Module Waterproof External Engine Board Remote Mount VK-162 USB - Walmart.com
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So you want a Stratum 1 NTP server...
Raspberry Pi GPS Module USB Port – Kuongshun Electronic Shop
GPS Time Sync Software for Windows OS – Off Grid Ham Radio OH8STN
USRP Open SDR B210 Metal Shell 705X Material, Œ GPS 10MHz USB PPS DC 6-12V | eBay
USB GPS Module – ODROID
Adafruit Ultimate GPS GNSS with USB - 99 channel w/10 Hz updates : ID 4279 : $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits
USB GPS Module – ODROID
Using the Sure Electronics GPS evaluation board for NTP