NorthStar Navigation Multi-Function Unit M84 - Manual (Page 49)

Northstar M121/M84 Installation and Operation Manual 48
13-3 When you add or remove fuel
When you add or remove fuel, you must tell
the M121/M84, otherwise the fuel data will be
meaningless.
A When you completely fill a tank
Go to the fuel display and press
MENU
.
Then:
On a single-tank boat, select Fill tank.
On a multi-tank boat, select Fill tank,
then select the tank you have filled.
Note: Underfloor fuel tanks are often difficult to
refill to the same level twice, due to air pockets.
With underfloor fuel tanks:
Trim the boat to the same angle in the water
each time you follow procedure A.
Mostly use procedure B below when adding
fuel, but completely fill the tank and follow
procedure A about every tenth time you add
fuel.
B When you part fill a tank
1 Add fuel to a tank and write down how
much fuel you add.
2 From the Fuel display, press
MENU
and select
Add fuel.
3 On a multi-tank boat, select the tank that
you have added fuel to.
4 Change the number to the amount of fuel
that you added.
Note: If you follow procedure B every time you
add fuel, then a small error will accumulate,
because it is hard to measure exactly how much
fuel you add. To avoid this, completely fill the
tank and follow procedure A about every tenth
time you add fuel.
C When you remove fuel
1. Before removing fuel, go to the Fuel display,
press
MENU
and select Set remaining.
Fuel flow
The fuel flow for the engine(s). On a multi
engine boat, the data for the port engine is on
the left of the display. Use the flows to check
the load of each engine.
Range
The estimated boat range at the current fuel
flow. The value can depend on the type of
speed sensor (see section 13-5).
Economy
The distance travelled per unit of fuel used. The
value can depend on the type of speed sensor
(see section 13-5). The larger the value, the
better the fuel economy. Adjust the throttle and
trim to achieve the best economy.
Fuel consumption curve
A graph of fuel consumption and boat speed
as a function of engine RPM. Use the curve to
monitor and optimize boat performance (see
section 13-6).
Remaining
The fuel remaining in the tank(s) is shown as a
vertical gauge on the right of the display. The
height of the yellow bar(s) show how much fuel
remains in the tank(s). If you have set a low fuel
alarm (see section 13-4), a red bar shows the
level at which the alarm will trigger. If there are
two tanks, the left bar shows the port tank, the
right bar shows the starboard tank.
Used
The fuel used during a trip. On a multi-engine
boat, the data for the port engine is on the left
of the display.
When you want to start measuring how much
fuel is used, go to the Fuel display and:
In a single engine boat, press
MENU
and
select Clear used.
In a multi-engine boat, the fuel used by
each engine and the total fuel used are
shown. Press
MENU
, select Clear used
and select:
Port or Starboard to clear the fuel used
by one engine
Both to clear the total fuel used.