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return meets certain additional criteria, a
fish symbol will be assigned. There are
three different size fish symbols used to
indicate the intensity of the sonar return.
While signal intensity is a good indicator
of relative fish size, different species of
fish have different sonar characteristics,
so it is not always possible to distinguish
fish size between varying species. The
signal intensity is "normalized" for
depth so that a small fish close to the
boat does not appear as a large fish
symbol.
ID+ adds an additional piece of
information to help the user locate fish.
On selected fish symbols, the digital
depth of the designated fish is drawn to help locate the fish vertically. This
is especially helpful in setting bait depths or for downrigger operation.
The fish symbols indicate the sonar beam the fish is detected in. This
gives you a reliable indicator of side to side location of the fish relative to
the boat. Fish symbols that are hollow are detected in the wide beam and
are around the boat. Solid fish symbols represent fish detected in the
narrow beam and are directly under the boat.
CONTROL FUNCTIONS
The 250DX uses a simple five button keypad for all user
input. Press any button and an audible “chirp” confirms
the control input. If a button has no function or is
inappropriate for the situation, an audible “error” is
heard. The unit sounds multiple chirps.
Power. The Power button powers the 250DX up for
normal operation. When the unit is on, POWER turns
the unit off. POWER can also be used to go directly into
Simulator mode. To enter simulator, with the unit
11
USING THE 250DX
CONTROL FUNCTIONS
Fish in Narrow Beam
ID+ Fish Depth
Fish in Wide Beam