This works for me HUAWEI P20 MATE android 9.1
GPS indicator is not work and batery.(but GPS work)
Sometimes garmin crash and for start must 5-7 X push butom.
works in internal memory.
[GARMIN] Garmin v2.37 (supports 6.0-9.0) [Download Link]

Download:
StreetPilot_v2.37.apk

[Only registered and activated users can see links. ]
StreetPilot_v2.37.apk