GNSS and AIS are not working

Hello,
first of all I am very happy that such a hat exists and I am looking forward to make it work and of course to use it at sea. Unfortunately the GNSS and the AIS are not  working.

• I am using a Raspberry Pi4 booting from a SSD (connected to a USB 2 port)
• Openplotter and 
• I do have an unobstructed view of the sky.
• I am using the internal GNSS antenna.
• Both green leds (AIS data and GNSS fox) are steady.
• The red light is off.

I must admit that the quality of my AIS antenna is questionable but I am hoping that solving the GNSS first could hit two birds with one stone.
I was also worried about the Radio Frequency Interferences from the USB 3 port, this is why I connected the SSD to a USB 2 port.
Finally, here is how my system looks like:
pi@openplotter:~ $ ~/moitessier/app/moitessier_ctrl/moitessier_ctrl_$(uname -r) /dev/moitessier.ctrl 1
opening device /dev/moitessier.ctrl
size – 204
mode – A
hardware ID – P770010
hardware version – E05
boot version –
app version – 1.6.0
gnss version – L86NR02A02S
functionality – 0xffffffff
system errors – 0x00000000
serial – 2d38323252524306001e000d
receiver 1
channel frequency 1 [Hz]: 161975000
channel frequency 2 [Hz]: 162025000
tcxo frequency [Hz]: 13000000
meta data mask: 0x00
afc range [Hz]: 1000
default afc range [Hz]: 1000
rng: 0x05 0x05
receiver 2
channel frequency 1 [Hz]: 161975000
channel frequency 2 [Hz]: 162025000
tcxo frequency [Hz]: 13000000
meta data mask: 0x00
afc range [Hz]: 1000
default afc range [Hz]: 1000
rng: 0x06 0x06
simulator
enabled: 0
interval: 1000
mmsi: 807977831 807977832
misc
write protection ID EEPROM: 1
write button pressed: 0
gnss satellite systems: 15
Would you be able to help?
Have a great weekend,
Christophe