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3.4. Depth functions (optional)
To change between Log and Depth information press MODE. This
function will display depth in metres, feet or fathoms. To change unit
see 4.2.6. A depth sounder measures the time it takes for a sound
pulse transmitted from the transducer, to bounce on the bottom and
be received by the transducer again. The strength of the sound
pulse decreases with the depth and is also affected
by temperature and pollution in the water. A soft bottom with a lot of
vegetation will also decrease the strength of the echo, which can result
in poor reception by the receiver. If no echo is registrated the depth
reading will be three dashes i.e. no echo.
3.4.1. Boat speed
To view boat speed press UP or DOWN until the text BSP is dis-
played. The unit (Knots or Miles/h) is selectable in calibration, see
4.2.4.
3.4.2. Shallow alarm
To get to the shallow alarm function, press UP or DOWN until the
text
SHALLOW is displayed. To change the alarm value, unlock with KEY,
increase/decrease the value with UP/DOWN, move to the next figure
with MODE button and lock the value again with KEY.
3.4.3. Deep alarm
To get to the deep alarm function press UP or DOWN until the text
DEEP is displayed. To change the alarm value, unlock with KEY,
increase/decrease the value with UP/DOWN, move to next figure
with MODE button and lock the value
again with KEY. The alarm is activated.
3.4.4. Silencing an alarm
If a shallow alarm limit is reached the instrument will display depth on
the top row
and the alarm limit flashing on the bottom row. To silence the alarm
press any
button or steer the boat to deeper water. The alarm will be automatically
activated
again if the boat is taken to deeper water ( 2 m more than the limit).
3.4.5. Activate / Deactivate an alarm
To activate / deactivate an alarm, go to the alarm function an press
UP and
DOWN together. If an alarm is active the present alarm value is dis-
played
together with the text SHA or DEP. If the alarm is deactivated the text
SHALLOW
or DEEP is displayed instead. The alarm value is stored in the memory
even if
the alarm is deactivated.