SUUNTO Vector HR - Manual (Page 52)

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7.3 TIMe
7.3.1 Why do the segments on the circumference increase and
decrease when I am in the Watch mode?
the main function of the segments is related to the compass mode, where a division into 36 segments is necessary due to the 360-
degree scale of a compass. In the Watch mode, the segments show the advancement of seconds. Because the number of seconds
differs from the number of degrees, it is impossible for the segments to be consecutively lit up; they now light up or extinguish, thereby
marking the passing of every second.
7.4 alTIMeTeR
7.4.1 How do you clear the logbook?
the logbook is self-erasing and cannot be cleared by the user.
7.4.2 How does the logbook self-erase?
The logbook is circular and will start erasing itself when all the memory places are filled. There are approx. 1,900 memory places, each
of which contain the altitude, the ascent/descent rate as well as heart rate at that time (according to the chosen interval, 0 seconds,
 minute, 0 or 60 minutes).
When all the memory places are filled, the logbook starts recording new logs on top of the oldest recordings. This is what is meant
when we say the logbook is “self-erasing”.
You can clear the history of the logbook; i.e. where you get the cumulative ascent and descent information based on the logs recorded
into the logbook.
7.4.3 How many logbooks can you record?
the number of logs you can record into the logbook depends on the chosen interval and the length of each log. for example, if your
interval is  minute, you can get a total of ,900 minutes of logs into the logbook. this equals .3 days if the recording is continuous
(24 hours = 1,440 minutes; 1,900/1,440=1,32).
to avoid excessive battery drain, the recording is not continuous. the recording functions have certain timeouts (i.e. the recording will
be turned off automatically after a certain time). the timeouts are shorter for the shorter interval and longer for the longer interval.