NorthStar Navigation Explorer 660 - Manual (Page 58)

Northstar Explorer 660 Installation and Operation Manual 58
Press MENU once or more until the Setup menu
is displayed, then select Calibrate:
The fuel options can be calibrated only when the
optional single or twin engine kit is installed on
petrol/gasoline engines.
Speed
This calibrates the speed from the paddlewheel
transducer. Calibration may be required because
different hull shapes have different flow
characteristics.Obtain an accurate measurement
of the boat's speed from a GPS receiver; or by
following another boat travelling at a known
speed; or by making a timed run over a known
distance.
Note: for accurate calibration:
• The speed from a GPS receiver should be
greater than 5 knots.
• The speed from another paddlewheel
transducer should be between 5 and
20 knots.
• Best results are achieved in calm conditions
where there is minimal current (best at high
or low tide).
Press or to change the displayed speed to
the true value.
Speed filter
Waves and wind cause the boat speed from the
paddlewheel transducer to fluctuate slightly. To
give stable readings, the Explorer 660 calculates
these values by taking several measurements and
averaging them. Set the Speed filter to the lowest
value which gives stable readings. The range is 1
to 30 seconds or Off (0).
15-11 Setup > Calibrate
Temperature
The factory settings should be sufficiently accurate
for normal usage. To calibrate the temperature
readout, first measure the water temperature with a
thermometer known to be accurate.
Use the cursor keys to display the temperature
readout box, then increase or decrease the
value to match the measured temperature. The
temperature can be set from 32° to 99.9°F (0° to
37.7°C) with a resolution of 0.1° unit.
To change the units between °F (Fahrenheit) or °C
(Celsius), see section 15-9.
Temperature filter
Water turbulence and currents cause the water
temperature to fluctuate slightly. To give stable
readings, the Explorer 660 calculates these values
by taking several measurements and averaging
them. Set the Temperature filter to the lowest
value which gives stable readings. The range is 1
to 30 seconds or Off (0).
Fuel
Calibrating the fuel usage can improve the
accuracy of fuel measurements.
Twin engine installations require each fuel
transducer to be calibrated. This can be done
at the same time with two portable tanks or at
different times using one portable tank.
Calibrating the fuel transducer(s) requires accurate
measurement of the fuel consumption. This is best
done using a small portable tank. At least 4 gallons
(15 litres) of fuel should be used to ensure an
accurate calibration.
It is often very difficult to fill underfloor tanks to the
same level twice due to air pockets, so the more
fuel used, the more accurate the calibration.
To calibrate the fuel transducer(s), perform the
following steps:
1. Record the level of the fuel in the tank(s).
2. Connect the portable tank(s) to the engine
through the fuel transducer(s).
3. Run the engine at normal cruising speed until
at least 4 gallons (15 litres) of fuel has been
used per engine.