I can't find "cam" in the log,what's the log_bitmask?

Log Analysis -- deprecated Copter Logs -- deprecated
1

Hi,would you give me a hand?

I use “Survey (Gird)” for aerial photography in Mission Planner 1.3.25,but I can not find the corresponding GPS latitude and longitude of aerial photographs in the log.And how to set "Log_bitmask "?

Thank you!