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Northstar Explorer 538i/538 Installation and Operation Manual
34
10-3-2 Managing fuel consumption curves
Record several curves for different conditions.
Renaming a curve
1 Press
one or more times until the
Setup menu is displayed, then select
Fuel.
2 Select Fuel consumption curve.
Select Name, press and select the
name of the curve to rename.
3 Select
Rename and press . Change the
name and press
.
Deleting a curve
1 Press
once or more until the Setup
menu is displayed, then select
Fuel.
2 Select Fuel consumption curve. Select
Name, press and select the name of
the curve to delete.
3 Select
Delete and press .
10-3-3 Using fuel consumption curves
A fuel consumption curve is displayed on the fuel
display:
a For a twin engine boat, keep the RPM of both
engines similar while using a curve.
Displaying a curve
1 To go to the Fuel display, press
, select
Other, then select Fuel.
2 Press , press and select the
name of the curve to display on the fuel
display.
Using a curve
Compare your boat’s performance now, at the
current RPMs, with the boat’s performance when
you made the curve. You can compare your
boat’s performance now with a curve made
under ideal conditions or with a curve made
under similar conditions.
Information in a curve
A RPM of the boat now. For a twin engine boat,
the RPM is the average of the two RPMs.
B Red curve: boat speeds at different
RPMs recorded when you made this fuel
consumption curve.
C Red marker: the boat speed now. This marker
is below the red curve, showing that the boat
speed now at this RPM is less than when you
recorded the curve.
D Blue curve: fuel consumption at different
RPMs recorded when you made this fuel
consumption curve.
E Blue marker: the fuel consumption now. This
marker is below the blue curve, showing that
the fuel usage now at this RPM is better than
when you recorded the curve.
F If the blue curve has a dip, then running the
boat at this RPM will give the best speed for
the least fuel consumption.
C
D
E
F
A
B