DS41 Owner’s Manual
5
4. Use the
"
and
#
keys to change the
value. If either key is held depressed for
more than one second the reading will
increase or decrease rapidly.
5. The offset can be programmed in 0.1 unit
steps from -9.9
!
9.9 feet (or equivalent).
When programmed for a negative offset, ‘-’
will be indicated on the left hand side of the
display.
6. To display depth below the keel enter the
vertical distance between the bottom of the
keel and the depth trasnducer as a
negative value.
7. To display depth below surface enter the
vertical distance from the waterline to the
depth transducer as a positive number (no
negative sign).
8. To exit this mode, press and hold both the
"
and
#
keys simultaneously. Alternatively,
if no keys are pressed for a period of 5
seconds normal depth display will resume.
OFF
OFF
ON
ON
^
^
V
V
Press simultaneously
The display will now indicate the current
water depth.
Transducer Setting
A Transducer Setting is provided to allow the
D41 to be used with different transducer types.
The default setting (=0.0) is used for most
transducers.
Some transducers ‘ring’ after the sonar transmit
pulse (just like hitting a bell). This ringing can be
interpreted as an echo from a shallow bottom.
The setting is used to increase the required level
that shallow echoes must meet before they will
be displayed.
If the D41 gives repeated false readings of 1.5
to 3 feet depth while in deep water the transducer
setting should be increased. Adjust it upward by
0.5 at a time and retest. The range of values is
-0.9 to +2.5. If the value is set too high it could
cause erratic readings in shallow water.
Changing the Transducer Setting
1. Apply power while holding down the
"
ON
key. The display will show either HOF or
SOF for 7 seconds. Continue to hold the
key down.
Units of Measure
To select the displayed unit
1. Apply power while holding down the
#
key.
OFF
OFF
ON
^
V
V
Hold down during power up
2. When the unit is on, release the
#
key. The
display will indicate the current display unit
with:
88
Ft
88
88
Feet Meters
88
FA
Fathoms
3. Use the
"
and
#
keys to change the
value.
4. To exit this mode, press and hold both the
"
and
#
keys simultaneously. Alternatively,
if no keys are pressed for a period of 5
seconds normal depth display will resume.
OFF
OFF
ON
ON
^
^
V
V
Press simultaneously
The display will now indicate the current
water depth in the selected display unit.
2. The display will show tdr.
tdr
3. Release the key.
4. After 2 seconds the display will show the
Transducer Setting value eg 0.0
5. Use the
"
and
#
keys to change the
value.
6. To exit this mode, press and hold both the
"
and
#
keys simultaneously.
