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47Northstar Explorer 657 Installation and Operation Manual
C When you remove fuel
1 Before removing fuel, go to the Fuel window,
press
and select Set remaining.
2 On a multi-tank boat, select the tank that you
are removing fuel from.
3 Write down the value of Remaining for the
tank; this is the amount of fuel originally in
the tank.
4 Remove fuel from the tank and write down
how much fuel you remove.
5 Subtract the amount of fuel you removed
from the amount of fuel originally in the tank
to calculate the amount of fuel now in the
tank.
6 Change the number on the Set Remaining
menu to the amount of fuel that you
calculated was now in the tank.
7 Press
Note: You can also use this procedure when you
add fuel to a tank. In this case, add the fuel you
have added to the amount of fuel originally in
the tank to calculate the amount of fuel now in
the tank.
To set a low fuel alarm for a tank:
1 Press
twice, select Fuel then select
Setup tanks.
2 On a multi-tank boat, select the tank to set
the alarm for.
3 Select Tank
alarm and enter a fuel level to
trigger the low fuel alarm.
12-4 Low fuel alarm
When a low fuel alarm is set, the alarm’s fuel level
is shown on the fuel window tank levels as a red
bar. The alarm can also be set using the Alarms
setup menu (see section 17-9)
12-5-1 Selecting a boat speed sensor
The fuel calculations can use boat speeds from
the GPS, or from a paddlewheel sensor or pitot
sensor if these optional sensors are installed:
Paddlewheel and pitot sensors measure the
speed through the water; GPS speed is speed
over ground; these sensors can give different
values for Range, Economy and the fuel
consumption curves (see section 12-5-2).
A pitot sensor is more accurate than a
paddlewheel sensor at high speeds but is
not accurate at low speeds. A paddlewheel
sensor is more accurate than a pitot sensor at
low speeds.
12-5 Boat speed sensors
To select an optional speed sensor
1 Press
twice, select Fuel and select
Speed source.
2 To use a paddlewheel or pitot sensor, select
Water speed, otherwise select Ground
speed to use GPS speed.
3 If you selected Water speed and you have
both a paddlewheel sensor and a pitot
sensor:
i Press
, select SmartCraft and
select Speed type
ii Select Paddlewheel or Pitot.
Tip: You can select a different speed sensor
during a trip.