The Alarms tab is used to reflect any dive alarm
conditions which may have occurred during a given dive.
These items are automatically set whenever a dive is
downloaded or imported from a logging device which registers alarm
information. In addition, certain alarm information is
dynamically determined by SurfaceInterval and may override
the dive computer's idea of what constitutes an alarm.
For further discussion on this override capability, see the
discussion below regarding the "Ascent Rate too fast"
alarm.
SurfaceInterval gathers alarm information either from downloaded dive profiles, or from imported dive data.
Whenever you navigate to a dive entry which has registered alarms,
a bullet  character will show up in the Alarms tab as in the picture above. This is true even if the
alarms tab is not currently the active tab. This lets you know that the
currently selected dive entry has alarms associated with it.
Ascent rate too fast
At some point during the dive, it was determined that the diver's
ascent rate exceeded that which is generally considered safe.
Typically, this is thought to be 60 ft/minute (or 20 meters/minute).
If you have enabled "Strict Validity Checking" in SurfaceInterval's
Preferences, the alarm will
be automatically set by SurfaceInterval if the associated threshold is exceeded,
even if a logging device failed to register an alarm condition.
Decompression violation
This alarm is set if the diver fails to perform any decompression stops as required
by the dive computer or algorithm in use. You may also set this checkbox manually if
a deco stop is known to have been missed, even if an alarm was not registered by a dive
computer or logging device.
Excessive workload
Certain air-integrated dive computers will register an alarm whenever the air consumption
rate makes a sudden increase. The assumption is that a sudden increase in air consumption
indicates that the diver's workload has increased beyond a safe level, and the diver is in
danger of "over-breathing" the regulator.
Computer lockout
A computer lockout alarm can occur if a diver violates the decompression instructions of
the dive computer to the extent where the dive computer can no provide safe information.
It is intended to prevent the diver from continuing the dive or diving again for the duration
of the lockout period.
Remaining Bottom Time
Some dive computers maintain an ongoing estimate of allowable remaining bottom time based on several
factors including remaining air supply, average air consumption rate, decompression data,
and safety reserve. The Remaining Bottom Time alarm is set whenever a diver ignores this
estimate and continues to dive after allowable Remaining Bottom time reaches zero.
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Alarms