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• Hold the arm wearing the watch at heart level while the
watch reads your blood oxygen saturation.
• Use a silicone or nylon band.
• Clean and dry your arm before putting on the watch.
• Avoid wearing sunscreen, lotion, and insect repellent
under the watch.
• Avoid scratching the optical sensor on the back of the
watch.
• Rinse the watch with fresh water after each workout.
Compass
The watch has a 3-axis compass with automatic
calibration. The compass features and appearance
change depending on your activity, whether GPS is
enabled, and whether you are navigating to a destination.
You can change the compass settings manually
(Compass Settings,
page 55).
Setting the Compass Heading
1 From the compass glance, press START.
2 Select Lock Heading.
3 Point the top of the watch toward your heading, and
press START.
When you deviate from the heading, the compass
displays the direction from the heading and degree of
deviation.
Compass Settings
Hold MENU, and select Sensors & Accessories >
Compass.
Calibrate: Allows you to manually calibrate the compass
sensor
(Calibrating the Compass Manually,
Display: Sets the directional heading on the compass to
letters, degrees, or milliradians.
North Ref.: Sets the north reference of the compass
(Setting the North Reference,
Mode: Sets the compass to use electronic-sensor data
only (On), a combination of GPS and electronic-sensor
data when moving (Auto), or GPS data only (Off).
Calibrating the Compass Manually
Calibrate the electronic compass outdoors. To improve
heading accuracy, do not stand near objects that influence
Altimeter Readings
This watch is not intended to provide primary flight information and is to be used for supplemental purposes only.
The altimeter functions differently depending on the selected source.
You can adjust the altimeter settings by holding MENU, selecting Activities & Apps > Fly, selecting the activity settings,
and selecting Altimeter.
Sensors and Accessories
page 55).
page 55).
NOTICE
magnetic fields, such as vehicles, buildings, and overhead
power lines.
Your watch was already calibrated at the factory, and
the watch uses automatic calibration by default. If you
experience irregular compass behavior, for example, after
moving long distances or after extreme temperature
changes, you can manually calibrate the compass.
1 Hold MENU.
2 Select Sensors & Accessories > Compass > Calibrate >
Start.
3 Follow the on-screen instructions.
TIP: Move your wrist in a small figure eight motion until
a message appears.
Setting the North Reference
You can set the directional reference used in calculating
heading information.
1 Hold MENU.
2 Select Sensors & Accessories > Compass > North Ref..
3 Select an option:
• To set geographic north as the heading reference,
select True.
• To set the magnetic declination for your location
automatically, select Magnetic.
• To set grid north (000º) as the heading reference,
select Grid.
• To set the magnetic variation value manually, select
User > Mag. Variation, enter the magnetic variation,
and select Done.
Altimeter and Barometer
The watch contains an internal altimeter and barometer.
The watch collects elevation and pressure data
continuously, even in low-power mode. The altimeter
displays your approximate elevation based on pressure
changes. The barometer displays environmental pressure
data based on the fixed elevation where the altimeter was
most recently calibrated
WARNING
(Altimeter Settings,
page 56).
55
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