GNSS Correction Data Receiver (NEO-D9S) Hookup Guide
bboyho, 
PaulZC Troubleshooting
If you need technical assistance and more information on a product that is not working as you expected, we recommend heading on over to the SparkFun Technical Assistance page for some initial troubleshooting.
If you don't find what you need there, the SparkFun Forums and u-blox Forums are great places to find and ask for help. For specific questions about the u-blox service, we recommend heading over more to the u-blox Forums.
ThingStream PointPerfect L-band Reception
In order to receive the u-blox ThingStream PointPerfect correction data, you will need:
- a suitable antenna
- to be located within contiguous USA
- to have a clear view of the sky to the South
SparkFun GNSS Multi-Band L1/L2 Surveying Antenna - TOP106
We have been successful using the SparkFun GNSS Multi-Band L1/L2 Surveying Antenna (TNC) - TOP106 (GPS-17751) antenna to receive PointPerfect correction data in the USA.
Thingstream PointPerfect Coverage
The PointPerfect GNSS augmentation service is available on a continental scale with seamless coverage in the contiguous USA, including up to 12 nautical miles (~ 22 km) off coastlines. Please note: the u-blox PointPerfect EU L-Band service is being suspended on March 10th 2025.
As stated earlier, make sure to check back on u-blox's website to see if there is additional coverage in your region. Note that while they recently updated the coverage to support South Korea, it seems to be available over IP only. SPARTN correction messages does not appear to be listed under their topics for L-band reception yet. There are additional regions under consideration for the future but they have not been included yet for L-band reception.
PointPerfect Satellite Broadcast
PointPerfect augmentation data is broadcast from a satellite covering the contiguous USA. The satellite is in geostationary orbits over the equator - the same as for satellite television broadcasts. It is essential that your antenna has an unobstructed view of the sky, especially to the South where the satellite is positioned.
Depending on your latitude, the satellite for your area could be low in the sky. You need to ensure that trees, buildings etc. are not blocking the signal.