Casio 3069 Manual page 144

Altimeter:
Measurement range: –700 to 10,000 m without reference altitude
Display range: –10,000 to 10,000 m
Negative values can be caused by readings produced based on a
reference altitude or due to atmospheric conditions.
Display unit: 5 m
Current Altitude Data: 5-second intervals for 1 hour (0'05),or 5-second
interval for first 3 minutes followed by 2-minute interval for next 9 or
10 hours (2'00)
Altitude Memory Data:
40 periodic records: Readings taken at measurement start,
measurement end, and minutes 00, 15, 30, and 45 each hour
One current session record: Readings taken 5-second intervals for 1
hour (0'05), or 5-second interval for first 3 minutes followed by 2-
minute interval for the next 9 or 10 hours (2'00), and used to update
values for high altitude, low altitude, total ascent, and total descent
One historical record: Keeps track of high altitude, low altitude, total
ascent, and total descent values of multiple sessions
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