12-6-2 Managing fuel consumption curves
Renaming a curve
1Press 
twice, then select Fuel.
2Select Fuel consumption curve. Select Name and select the name of the curve to rename.
3Select Rename and press 
. Change the name.
12-6-3 Using fuel consumption curves
Deleting a curve
1Press 
twice, then select Fuel.
2Select Fuel consumption curve. Select Name and select the name of the curve to delete.
3Select Delete.
Selecting a curve
1You must make a fuel consumption curve before you can use it (see section
2On the Fuel window, press 
, select Fuel consumption curve and select the name of the curve to use.
3On the fuel window, press 
if necessary to select Fuel curve and display the fuel consumption curve.
Note:
aOn a multi engine boat, keep the RPM of all engines similar while using a curve.
bThe shape of the curve depends on the type of speed sensor you selected when making the curve (see sections
Using a curve
F
E
DB
C
A
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
ARPM of the boat now. For a twin engine boat, the RPM is the average of the two RPMs.
BRed curve: boat speeds at different RPMs recorded when you made this fuel consumption curve.
CRed 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.
DBlue curve: fuel consumption at different RPMs recorded when you made this fuel consumption curve.
EBlue marker: the fuel consumption now. This marker is below the blue curve, showing that the fuel consumption now at this RPM is better than when you recorded the curve.
FIf the blue curve has a dip, then running the boat at this RPM will give the best speed for the least fuel consumption.
50 | Northstar Explorer 657 Installation and Operation Manual |