Just did a comparison test between the GPS on KW88 and my Galaxy S4.
Sunny and clear skies today: 13:50 hours.
Galaxy S4 shows 22 satellites found, 19 connected with good to fair SNR.
KW88 found 12 satellites with 4 connected average to poor SNR.
Confirmed, KW88 GPS is not suited for real navigation applications. It might work in an emergency situation if you have the time to wait for an intermittently found location fix.
Inside my studio 1,5 meters from the (open) window the S4 still connects 16 of 21 found satellites, the KW88 no connection of 12 found.
I believe the “found” satellites can be related to downloaded A-GPS data. So these satellites are not “really” found by the antenna. The software just knows they should be the nearest ones to my location.