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I can see about 15 satellites (about 10 GPS + 5 Glonass) in u-center, but I see only about 10 satellites using TinyGPS++. I suspect that TinyGPS++ can see GPS only. I see lines containing $GNRMC $GNVTG $GNGGA $GPGSV $GNGLL $GNVTG $GLGSV in the input, so there are information from both constellation. But how can I check which constellations TinyGPS++ takes into account for the output:

Sats=10 Nums=1 3 8 10 11 14 20 22 24 27 28 31 32 36 40 Elevation=46 17 45 31 69 59 1 43 5 24 9 1 60 36 32 Azimuth=304 255 215 66 267 137 77 263 28 184 316 140 89 181 150 SNR=12 0 0 17 8 20 0 11 0 11 0 0 21 0 0

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    TinyGPS++ is just a text parsing library you can read and examine May 26, 2020 at 11:07
  • gpsinformation.org/dale/nmea.htm#GSV SNR=0 means the satellite can be seen but may not be being used for your positional fix.
    – Dougie
    May 26, 2020 at 12:00

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There is a bug in TinyGPS++ as it only counts GPS satellites. See https://github.com/mikalhart/TinyGPSPlus/issues/52

PRN numbers are used to identify satellites:

GPS = 1 to 32

SBAS = 33 to 64 (add 87 for PRN number)

GLO = 65 to 96

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