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6
2.4.7. Water density
There is a direct relationship between the
weight of a water column and the pressure
exerted by it, and the weight is given by the
depth multiplied by the density of the water.
Hence, the depth displayed by a dive
computer is obtained by a measurement of
absolute pressure.
Water density, however, is a function of
salinity, so that the same depth in a lake
(fresh water) and in an ocean (salt water)
will yield a different pressure measurement.
The difference is very small, with a
corresponding error in displayed depth
(approximately 3%). For this reason, in
SCUBA and GAUGE modes, Galileo
allows to defi ne whether the dive is in fresh
or salt water.
A decompression calculation is based
on absolute pressure, so even setting
Galileo to fresh water when diving in salt
water, or vice versa, is acceptable. The
depth measurement will be slightly off
(approximately 1m/3ft every 40m/130ft),
but the decompression calculation will be
carried out correctly. For Apnea diving,
in which no decompression calculation
takes place, the maximum depth reached
by the diver may be the main goal of
the dive, so the accuracy in the depth
measurement itself is the most important
factor. Galileo allows you to defi ne a water
density between 1.000kg/l and 1.050kg/l in
0.001kg/l increments.
For reference, the density of the salt water
setting in SCUBA or GAUGE mode is
1.025kg/l.
3. Logbook
Due to the different nature of Apnea diving
with respect to regular scuba diving, the
logbook changes in appearance also.
One session can include several dives,
thus the fi rst page shows the deepest
dive but also the longest dive (in minutes
and seconds). It lists in addition the
total duration of the session (in minutes,
including time spent at the surface), the total
number of dives and the lowest measured
temperature.
By pressing >>, the depth profi le together
with the temperature profi le is shown. If the
heart rate* monitor was turned ON, then
pressing >> brings up the depth profi le
together with the heart rate profi le.
*only possible using HRM and Polar strap
8


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