No, the Garmin Cirqa does not require a subscription. All health and fitness data collected by the device is accessible for free through the Garmin Connect app, distinguishing it from many other health trackers that lock features behind a paywall.

Yes, you can use the Cirqa alongside another Garmin watch. You must go into the Garmin Connect app settings and set the Cirqa as your 'Primary Wearable' for all-day health tracking and your other watch as your 'Primary Training Device' for workouts to prevent data conflicts.

Ensure the band is worn snugly against the skin, roughly one finger-width above your wrist bone. If you continue to see inaccurate readings, consider using an upper-arm band accessory, which provides better sensor contact and is less prone to the movement noise common with wrist-worn devices.

The device typically requires about one week of consistent 24/7 wear to establish a reliable baseline for metrics like HRV status and Body Battery. Avoid making major training changes based on data from the first few days while the device is still calibrating to your physiological profile.

Common signs include significant changes in sleep patterns, persistent irritability, social withdrawal, difficulty concentrating, and expressed feelings of hopelessness. These behaviors often deviate from the individual's baseline and can indicate that the stress of the deployment is exceeding their current coping mechanisms.