Satellite identifier 90 from Garmin GLO 1 receiver

I have a Garmin GLO 1 receiver which I use with :-

Code:

ultragpslogger.com

application on my LG Stylo 5 Android phone. I can record the NMEA sentences that the receiver is issuing. I did this at a nearby large parking lot for a shopping complex, where there is a clear view of the sky in all directions, with the receiver at a fixed location and recording at the maximum rate for 4 minutes. In the $GPGSV sentences I see 90 & 91 as a satellite numbers. I also see the numbers 90 & 91 in some of the $GPGSA sentences. These two numbers are not shown in the list of GLONASS satellites given at this web location :-

Code:

gpsrchive.com/Shared/Satellites/Satellites.html#Track%20GLONASS

I am puzzled & wonder what to make of these two numbers (90 & 91). My guide for interpreting NMEA sentences is at this web address :-

Code:

aprs.gids.nl/nmea/#gsa

 

The Garmin GLO 1 receiver recognizes both GPS and GLONASS satellites, but all its NMEA sentences start with $GP. this website :-

Code:

gpsrchive.com/Shared/Satellites/Satellites.html#Satellite%20Identification-PRN

says that the offset for GLONASS identifiers is 64.