SUUNTO X6HR - Manual (Page 17)

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Heart rate
active, when the heart rate monitor is receiving heart rate signal. flashes in sync with
the heart rate.
2.2.2. Start Button
Short press
• In Chrono mode, it starts timing and saves and displays the intermediate times.
• In Hiking mode, it saves the mark points (altitude, heart rate and time).
Long press
• activates the backlight when the backlight is not set to the off position. for more
information on backlight settings, refer to chapter 3..5.
2.2. BUTTONS
2.2.1. Short and Long Press
the buttons may have different functions
depending on how long you press them.
the ordinary press or short press means that
the button is pressed quickly.
the long press means that the button is pressed
for more than  seconds.