Teleflex TFX100ID Operation Manual page 6

USING THE 100ID SERIES
USING DEPTH OFFSET
offset value at start up which the unit
adds or subtracts to the sonar depth
measured from the location of the
transducer.
When you turn on the 100ID, the
Depth Offset screen will appear for
several seconds to allow time to select
your depth offset. Use the UP or
DOWN arrows to adjust the setting to
yield the desired depth measurement
as follows.
Selecting a positive number equal to
the vertical distance between the trans-
ducer and waterline provides a depth
reading approximated from the water-
line. This "true depth" is useful for
comparing to depth soundings plotted
on navigation charts. Use caution when
operating in suspected shallow water
as many factors such as tide and waves
can effect the actual depth.
Selecting a negative number equal to
the vertical distance between the
transducer and lowest point of the hull
will give depth readouts from the
bottom of the hull, or keel.
Leaving the depth offset at zero will
have no effect on the depth readout as
measured from the transducer.
Depth Offset has a range of adjust-
ment of -10 to +10 feet, and must be
set at start-up each time the unit is powered on.
4
Depth Offset to Waterline
Depth Offset to Keel