uBlox helped us with the inspection of this board; we followed all its recommendations, plus, we added our own criteria to make sure we are providing you with a superb module.
The modules have the standard GPS 6-Pins JST-GH connector defined here
The module also features an auxiliary i2c port for future expansion using JST-GH connector standard
and a status -pink- LED.
You can read more about all its features on the official u-Blox web page here
. Remember we are using NEO-M8N-01, 'Professional grade.'