Highgear Aerial - Manual (Page 34)

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sKI chronoGraph
setting the sKi Chronograph
The primary display of the Ski Chronograph shows your current
altitude in the top line, a 10-second count-down timer in the center
line and your stored base altitude in the lower line.
storing a Base altitude
A Base Altitude can be stored either automatically or manually.
autoMatiC store –
When you are physically at the location you want to establish
as your base altitude (such as if you are standing at the bottom
of a run you want to time), simply press & hold the s2
key. The center line of the display will show store while the
current altitude is being stored as the base altitude. When
complete the center line of the display will show stored and
you may release the s2 key. Your new base altitude will
now be displayed in the lower line of the display.
The ATF8 / Alterra / Altiforce / Aerial units are equipped with a timer system which is started at the top
of a run and will track the time of your ski runs back to the base, stopping at a preset base altitude.