Garmin 16-HVS Instruction Manual page 22

Appendix A. CR23X/CR10X Programs
The datalogger will not pick up valid data until the GPS16-HVS has a valid
GPS fix, except during a GPS16-HVS warm start where time can be read
before position is known. Don't spend a lot of time trouble shooting a
phantom problem just because the GPS receiver does not have a valid GPS fix.
A-9