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INSIGHT
A
S
ALTITUDE DIVING
Diving at high Altitude requires special knowledge of the variations imposed upon divers, their activi-
ties, and their equipment by the decrease in atmospheric pressures. Sherwood Scuba recommends
completion of a specialized Altitude training course by a recognized training agency prior to diving in
high Altitude lakes or rivers.
Atmospheric pressure decreases as Altitude increases above sea level. Weather systems and ambient
temperature also affect barometric pressures. Consequently, depth reading instruments that do not
compensate for the decrease in ambient pressure indicate depth readings shallower than the depth they
are actually at.
The INSIGHT automatically compensates for decreased ambient pressures for Altitudes between
3,000 (915 meters) and 14,000 feet (4,270 meters). Its program contains a high altitude algorithm that
reduces no decompression and oxygen exposure limits to add a larger zone of caution.
The INSIGHT senses ambient pressure when it is activated, every 15 minutes while it is activated, or
every 30 minutes when it is not activated. At an Altitude of 3,001 feet (916 meters), it will automati-
cally recalibrate itself to measure depth in feet of fresh water rather than feet of sea water. It will then
readjust the no decompression and oxygen limits at additional intervals of 1,000 feet (305 meters).
Therefore, when returning to lower Altitudes, diving should not be conducted until the unit automati-
cally clears of any residual nitrogen and oxygen loading and resets to operate at the new lower Alti-
tude.
Altitude Level is displayed on the Data screens (Fig. 86a).
SEA = 0 - 3,000 ft
0 - 915 m
L2 = 3,001 - 5,000 ft
916 - 1,525 m
L3 = 5,001 - 7,000 ft
1,526 - 2,135 m
L4 = 7,001 - 9,000 ft
2,136 - 2,745 m
L5 = 9,001 - 11,000 ft
2,746 - 3,355 m
L6 = 11,001 - 13,000 ft
3,356 - 3,965 m
L7 = 13,001 - 14,000 ft
3,966 - 4,270 m
outr => 14,000 ft
4,270 m
Fig. 86 - Altitude
a