Casio 3521, Operation Manual, Page: 13 / 21

Measuring Elapsed Dive
Time
Dive time is measured in units of one second
up to 23 hours, 59 minutes, 59 seconds (24
hours).
1.
Enter the Dive Mode.
l
Navigating Between Modes
2.
Press (D).
This starts dive time measurement.
Dive graph
Dive start time
Current time
Dive time (hours, minutes, seconds)
3.
Hold down (D) for at least one second to
stop dive time measurement.
This starts surface interval measurement.
4.
Press (A) to reset the measurement time
to all zeros.
●
Resetting the measurement causes log
data to be recorded.
Note
●
The surface interval is not displayed
during measurement. Only the latest
log data record is displayed in the Log
Data Recall Mode.
l
Viewing Dive Log Data
●
After you finish Dive Mode
measurement, holding down (C) for at
least one second to enter the
Timekeeping Mode also reset
measurement up to that point.
●
Even if you return to the Timekeeping
Mode while a Dive Mode dive time
measurement operation is in progress,
the watch continues the measurement
operation internally.
●
If 11 or 12 hours elapse after the watch
enters the Dive Mode, it automatically
returns to the Timekeeping Mode.
Measuring Surface Interval
Time
This function measures the time since your
last dive as surface interval time, which can be
used in preparation for repetitive diving.
The surface interval time can be measured up
to 48 hours in one-minute increments.
1.
Enter the Dive Mode.
l
Navigating Between Modes
2.
Use the operations below to perform a
timer operation.
D
D
D
D
Surface Interval 1 start
(Hold down at least one second.)
Dive 1 start
Dive 2 start
Surface Interval 2 start
(Hold down at least one second.)
3.
To reset the ongoing surface interval
measurement operation, press (A).
●
Resetting the measurement causes log
data to be recorded.
Note
●
The surface interval is not displayed
during measurement. Only the latest
log data record is displayed in the Log
Data Recall Mode.
l
Viewing Dive Log Data
●
Even if you return to the Timekeeping
Mode while a Dive Mode dive time
measurement operation is in progress,
the watch continues the measurement
operation internally.
●
If 11 or 12 hours elapse after the watch
enters the Dive Mode, it automatically
returns to the Timekeeping Mode.
Exiting the Dive Mode
After you finish performing dive time
measurement in the Dive Mode, holding down
(C) for at least one second enters the
Timekeeping Mode.
●
Even if you return to the Timekeeping Mode
while a dive time measurement operation is
in progress, the watch continues the
measurement operation internally.
Viewing Dive Log Data
1.
Enter the Log Data Recall Mode.
l
Navigating Between Modes
This displays the latest log data.
Dive time
Dive start time
Interval time
Log record
number
●
The interval time is shown on the latest
log data record only.
●
The message [- : - -] appears when there
is no log data.
2.
Press (D).
Each press of (D) scrolls back from the
newest log data record.
Dive time
Dive start time
Dive start month and day
Log record number
●
Older data records have lower record
numbers.
Watch Operation Guide 3521
13