20 Sensors and Accessories
Calibrate: Allows you to manually calibrate the
compass sensor (Calibrating the Compass Manually,
page20).
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, page20).
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
NOTICE
Calibrate the electronic compass outdoors. To improve
heading accuracy, do not stand near objects that
influence 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 (Altimeter Settings, page20).
Altimeter Settings
Hold MENU, and select Sensors & Accessories >
Altimeter.
Calibrate: Allows you to manually calibrate the
altimeter sensor.
Auto Cal�: Allows the altimeter to self-calibrate each
time you use satellite systems.
Sensor Mode: Sets the mode for the sensor. The Auto
option uses both the altimeter and barometer
according to your movement. You can use the
Altimeter Only option when your activity involves
changes in altitude, or the Barometer Only option
when your activity does not involve changes in
altitude.
Elevation: Sets the units of measure for elevation.
Calibrating the Barometric Altimeter
Your watch was already calibrated at the factory, and
the watch uses automatic calibration at your GPS
starting point by default. You can manually calibrate the
barometric altimeter if you know the correct elevation.
1 Hold MENU.
2 Select Sensors & Accessories > Altimeter.
3 Select an option:
• To calibrate automatically from your GPS starting
point, select Auto Cal�.
• To enter the current elevation manually, select
Calibrate > Enter Manually.
• To enter the current elevation from the digital
elevation model, select Calibrate > Use DEM.
NOTE: Some watches require a phone
connection to use DEM for calibration.
• To enter the current elevation from your GPS
location, select Calibrate > Use GPS.
Barometer Settings
Hold MENU, and select Sensors & Accessories >
Barometer.
Calibrate: Allows you to manually calibrate the
barometer sensor.
Plot: Sets the time scale for the chart in the barometer
glance.
Storm Alert: Sets the rate of barometric pressure
change that triggers a storm alert.
Sensor Mode: Sets the mode for the sensor. The Auto
option uses both the altimeter and barometer
according to your movement. You can use the
Altimeter Only option when your activity involves
changes in altitude, or the Barometer Only option
when your activity does not involve changes in
altitude.
Pressure: Sets how the watch displays pressure data.
Calibrating the Barometer
Your watch was already calibrated at the factory, and
the watch uses automatic calibration at your GPS