What is it?

An M.2 2242 GPS board, compliant with OCP M.2 Sync specification: https://www.opencompute.org/documents/m-2-sync-module-ocp-base-specification-1-1-pdf.

This board uses ZED-F9P-05B as the GPS receiver. Hardware design is fully open source: https://github.com/Time-Appliances-Project/Time-Card/tree/master/GNSS/UBlox/M2-ZED-F9T

With this, you can turn the TimeHAT into PTP Grandmaster AND RTK Base station.

What's in the box

1. ZED-F9P M.2 board

2. U.FL to SMA adapter cable

3. M.2 screw

Why did you make it?

This board is meant to work in any PCIe card or design that supports OCP M.2 GPS receivers. Currently designs that I know support this:

1. TimeHAT: https://www.tindie.com/products/timeappliances/timehat-2/

2. Time Card: https://github.com/opencomputeproject/Time-Appliance-Project/tree/master , https://www.makerfabs.com/ocp-tap-time-card.html

Specifically, the F9P is used for positioning applications, and RTK for high precision positioning. Websites discussing RTK: https://www.u-blox.com/en/technologies/rtk-real-time-kinematic https://en.wikipedia.org/wiki/Real-time_kinematic_positioning https://learn.sparkfun.com/tutorials/what-is-gps-rtk/all

How to use it

For use with the TimeHAT, I recommend this software: https://github.com/Stefal/rtkbase

With rtkbase and TimeHAT, you will need to change the install.sh to add ttyAMA0 , search for ttyUSB0 in file, then add ttyAMA0 to the list. Then you can run the install script

sudo ./install.sh --detect-gnss --configure-gnss

rtkbase will also run gpsd so you can use cgps. It will configure the receiver for 115200 baud rate and save that change, just a note if you try to uninstall rtkbase and go back to manual gpsd.