Not receiving GPS data from NB-IOT deluxe shield

I have connected NB-IOT dual band deluxe shield to Arduino Uno board. I am running Sodaq_NB-IoT_All_Sensors example on it.

I am unable to receive GPS data from the ublox chip. Here is the data I see on serial monitor:

parseGPGGA

GNGGA,0,00,99.99,
parseGPGSA

GNGSA,A,1,99.99,99.99,99.99
parseGPGSA

GNGSA,A,1,99.99,99.99,99.99
parseGPGSV

GPGSV,1,1,00
?? >> $GLGSV,1,1,00*65
parseGPGLL

GNGLL,V,N
parseGPRMC

GNRMC,V,N
parseGPVTG

GNVTG,N

what could be the reason behind this? By the way, I do not have NB-IOT SIM at the moment, so I have commented out the NB-IOT related code from this example.

That output looks like you are not getting a GPS lock (yet). Try leaving the device on for longer, the output should change as the device gets a lock. You may need to test it outside.

Looks like you get data from the GPS, but the data is not that usefull yet.
Bring the GPS closer to the window (open window) should to the trick.