Hey, @Fred-1047!
Yes, a user with MyAdmin (global user) credentials can log into the Geotab Drive app. The only thing that's required for this is that the user have "Yes" selected under the Driver tab where it asks if This user is a driver.
Best,
P.S. Any pre-built user clearance that is at least at or above the Drive app user clearance can use the Geotab Drive app as long as their driver tab indicates that they are a driver. So, and Admin or Supervisor could use this as well.

