occurrences of obtaining slightly different altitude readings and corresponding no-
decompression (NDC) limits when diving within a given area. However, ZONE reduces
the accuracy of the altitude compensation for the first 600 metres above sea level, since
all altitudes below 600 metres are treated as sea level. However, the advantage in
ZONE is that changes in apparent altitude due to temperature or weather changes at
sea level will not affect the NDC computations.
In SEAMLESS, the algorithm is adjusted for extremely small changes in altitude.
However, a difference in altitude may be seen from day-to-day at a given dive site due
to temperature or weather systems and their effect on barometric pressures.
SEAMLESS will provide the most accurate altitude compensation algorithm, but normal
variations in atmospheric barometric pressure may affect the no-decompression time
which is more predominantly seen in the Pre-dive Prediction forecast.
METRIC/IMPERIAL MODES: Most dive computers always compute in either Metric or
Imperial units and merely convert the display to the other units. The COMMANDER+
actually computes and displays in the selected units which gives maximum accuracy
and user familiarity. If the computer is computing and displaying in Metric, the
“METRIC” legend will be illuminated when the computer is on. Metric/Imperial selection
is made using the Analyst
®
software. Changing Modes does not affect any profiles or
data stored in the computer.
11
LOW BATTERY INDICATIONS: Fresh ENERGIZER
®
brand batteries should read about
3.2 volts on the PreDive Prediction display. When the battery voltage decays to 2.5
volts, the “BATT” legend will be illuminated. It is recommended to change the batteries
at this point, but several dives might still remain possible. When the battery voltage
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