USB GPS Module – ODROID
Building a Raspberry-Pi Stratum-1 NTP Server
Frontiers | Time Synchronization for Wireless Sensors Using Low-Cost GPS Module and Arduino | Built Environment
GPS-DO expansion board GPS input PPS and 10MHz output port USB PC | eBay
Raspberry Pi GPS Module USB Port – Kuongshun Electronic Shop
An NTP Stratum-1 clock usng a GPS 18 LVC and FreeBSD
RY725AI 10Hz UART USB interface GPS w/ Glonass QZSS Antenna | Electrical Engineering and Computer Science | Oregon State University
PPS over USB
So you want a Stratum 1 NTP server...
Getting GPS to work on a Raspberry PI – Peter Mount's Blog
Microsecond accurate NTP with a Raspberry Pi and PPS GPS - Austin's Nerdy Things
China Beitian USB Glonass GPS Receiver Gnss Receiver Nmea-0183 Flash Auto-Adapted Baud Rate Better Than Bu-353s4 Bn-81u - China GPS Receiver, USB GPS Receiver
USB GPS GLONASS receiver dual GNSS receiver module antenna, New USB protocol 0183NMEA replace BU353,|gps glonass receiver|glonass receivergnss receiver - AliExpress
Millisecond accurate Chrony NTP with a USB GPS for $12 USD - Austin's Nerdy Things
So you want a Stratum 1 NTP server...
Adafruit Ultimate GPS with USB - 66 channel w/10 Hz updates - Boutique Semageek
GPS time synchronization tutorial - Lammert Bies
Adding PPS to a cheap USB GPS stick | Brendan's Radio Blog
z050 USB GPS Dongle with PPS - ZTI
GR-701W 1 pps via USB G-Mouse Receiver (Important: European customers shall check new VAT rules before on-line orders as below) | Taiwantrade.com
Adding PPS to a cheap USB GPS stick | Brendan's Radio Blog
Time Server
Creating an NTP Server Using GPS/PPS | ODROID Magazine
So you want a Stratum 1 NTP server...
USB GPS Receiver Module GNSS GLONASS Antenna Laptop PC Tablet Car Navigation for Win7 Win8 Win10 XP G72|Drone GPS| - AliExpress
Adding PPS to a cheap USB GPS stick | Brendan's Radio Blog
