I have been using the MKR1400 for a couple of weeks, and I find it a very comfortable board.
However, I am having some trouble with its GPS accuracy.
Usually I am receiving something like:
Accuracy: +/- 4400 m
Its accuracy usually is many km away from the target point, and I was wondering if there is any advice on how to improve this.
The SIM card works fine - usually on the same spot with my phone I get a good signal and GPS reading.
There is an additional power supply (USB connection, plus a 2A battery
There is an antenna attached
Using the basic GPS location example from the library
I noticed it does take anything up to a few minutes for location to start reporting more accuratley. Bear in mind it's not a true GPS, it is reporting the accuracy based on cell phone tower location / triangulation. Pretty sure it's called GNSS, could be wrong though.
Best advice is to setup a sketch that continually checks the GPS location and then only sets it when the accuracy is less than 4 kilometers or similar.
The unit would obviously need to remain powered on and checking in with the network while you are trying to get your accuracy back up. When testing my unit in town, with multiple towers accuracy was down to within 100's of meters easily.