I am using a NEO-7M GPS module on a KroozSD controller, and it works pretty fine. I had a few issues to get it work, but after having setup the Ublox in the UBlox U-Center software (particularly the Baud-rate), I happy with it and I get fixes even inside the house.
That's how I put up the airframe:
<define name="GPS_UBX_NAV5_DYNAMICS" value="NAV5_DYN_PEDESTRIAN" />
<define name="GPS_GPS_BAUD" value="38400" />
<define name="GPS_UBX_UCENTER_RATE" value="0x00FA" />
<subsystem name="gps" type="ublox">
<configure name="GPS_BAUD" value="B38400"/> <!-- modify baud rate if not already defined default by board -->
<!-- <configure name="GPS_PORT" value="UART3"/> modify telemetry UART if not already defined default by board -->
I am not expert in paparazzi and probably there are easier ways to get it done, but in my case it works...
Hope, it helps.