Navman TRACKFISH 6500 Installation And Operation Manual page 84

- re-routing the power and transducer
cable(s) away from the boat's other
electrical wiring.
- routing the display unit's power cable
directly to the battery with an in-line
fuse.
4-2 Bottom is not displayed:
a The TRACKFISH may have Manual Range
selected and the depth may be outside
the range value selected. Either change
the TRACKFISH to Auto Range or select
another depth range (see section 8-5).
b The depth may be outside the TRACKFISH's
range. While in Auto Range, the display unit
will display "--.-" to indicate that there is no
bottom detected. A display of the bottom
should reappear when in shallower water.
4-3 The bottom is displayed too far up
the screen:
The TRACKFISH may have Manual Range
selected and the selected Range value
is too high for the depth. Either change
the TRACKFISH to Auto Range or select
another depth range (see section 8-5)
4-4 Bottom echo disappears or erratic digital
reading while the boat is moving:
a Ensure the back of the bottom surface
of the transducer is slightly lower than
the front and the front is as deep in the
water as possible in order to minimise the
generation of bubbles through cavitation.
(See the Transom Transducers Installation
Guide, for more information.)
b The transducer may be in turbulent water.
Air bubbles in the water disrupt the echoes
returned, interfering with the TRACKFISH's
ability to find the bottom or other targets.
This often happens when the boat is
reversed. The transducer must be mounted
in a smooth flow of water in order for the
TRACKFISH to work at all boat speeds.
c Electrical noise from the boat's motor can
interfere with the TRACKFISH. Try some
suppression spark plugs.
84
4-5 There is a double bottom trace displayed:
a The boat may be in an area that generates
shadows (see section 8-2).
b In shallow water, the echoes may bounce.
Reduce the gain setting (see section 8-6)
and/or reduce the sonar pulse power (see
section 17-3).
c Decrease the Range.
NAVMAN
TRACKFISH 6500 Installation and Operation Manual