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FF520 Page 41
7.13 The Fish Finder is in Auto Gain mode but the picture display too many
small targets, what shall I do to reduce the screen clutter?
Try increasing the NOISE LEVEL or decreasing the GAIN OFFSET.
7.14 In very shallow waters when the Auto Gain mode is selected there are
fluctuations in the bottom profile width and its color representation.
What should I do?
In very shallow waters the environment situation (bottom/water condition) change very
quickly thus causing the auto gain algorithm to create oscillations while trying to set optimal
GAIN value for each situation. To avoid this it is advisable to switch to MANUAL GAIN mode
and fine tune the GAIN to a fixed setting.
7.15 In very deep waters even setting the GAIN to its maximum value I cannot
see the bottom what shall I do?
Try decreasing the NOISE LEVEL. If still the bottom is not visible there is nothing you can
do, the bottom echo is simply too weak to be detected.
7.16 GPS Chart Plotter shows no data when viewing the Fish Finder page
This may be due to the FF520 having an issue. To confirm, listen to the depth transducer
for the transmit pulse. If the pulse is not heard the FF520 is defective.
7.17 LED Status Indicator
The FF520 has a small LED that blinks. There are seven different LED behaviours,
representing seven different diagnostic conditions described below.
· OFF : DC power is not being supplied to the
FF520.
· ON CONTINUOUSLY : The transducer is not connected to the
GPS Chart Plotter or problem with cable of
the transducer cable.
· 1 LONG FLASH EVERY 2 SECONDS :The FF520 is not connected with the GPS
Chart Plotter.
· 1 SHORT FLASH EVERY 2 SECONDS : The FF520 is connected to the GPS Chart
Plotter and is operating correctly.
· 2 SHORT FLASHES EVERY 2 SECONDS:The FF520 is connected to the GPS Chart
Plotter and is operating correctly.
· 3 SHORT FLASHES EVERY 2 SECONDS: A non-Standard Horizon transducer (with-
out transducer ID) has been connected
· 4 SHORT FLASHES EVERY 2 SECONDS: No transducer connected.