NorthStar EXPLORER 443D Installation And Operation Manual page 38

d) A higher fuel Flow filter setting be
used on EFI (fuel injected) engines. See
section 3-3 Setup > Fuel.
13. There is no reading for fuel economy:
a) The boat must be travelling through the
water to generate an Economy reading.
b) Check that the paddlewheel on the
transducer is spinning freely and that the two
magnets in the paddlewheel are still
in place.
14. There is a double bottom trace
displayed:
a) The boat may be in an area that generates
shadows. See section 4-1 Interpreting the
display.
b) In shallow water, the echoes may bounce.
Reduce the gain setting (see section 4-4
Gain) and/or reduce the sonar pulse power
(see section 3-2 Setup > Sonar).
c) Decrease the Range.
15. No Sonar Display
Sonar is turned off. See Section 3-1
System > Setup.