Casio 3145 Manual page 50

How the historical record is updated
The watch performs the following operations continually while an Altimeter
Mode stopwatch operation is in progress.
Data
High Altitude
Low Altitude
Total Ascent
Total Descent
• See "Clearing the Historical Record" (page E-58) for information about
clearing the historical record, which restarts all data values from zero.
E-48
The historical record value is compared with the current
reading and the greater of the two is recorded in the
historical record.
The historical record value is compared with the current
reading, and the lesser of the two is recorded in the
historical record.
The current Altimeter Mode stopwatch session value is
added to the historical record value when the current
Altimeter Mode stopwatch session is reset to all zeros.
Update Operation