I own this same device. The “Daily Activity” entry is calculated from your step count. If you go to the Garmin Connect webpage, on the Daily Summary Activities tab, you can see your step count and the calories calculated. You will find it is equal to the “Daily Activity” entry imported by CRON-O-Meter.
I haven’t found a way to prevent Garmin from exporting this data or CRON-O-Meter from importing it. Even if I delete it from my CRON-O-Meter diary, it reappears next time the app syncs with Garmin Connect. It pollutes my data in CRON-O-Meter, as I want to see only the intentional fitness activities for each day, not incidental things like walking around.
This reply was modified 8 months ago by melonhead.
You can set your general activity in Cronometer to none and then have the import from Garmin be your activity. That would be a more accurate rendering of what you are doing since we use a formula to estimate what you are doing.