NorthStar Navigation EXPLORER 435 Manual Do Utilizador

Northstar Explorer 435/438 Installation and Operation Manual

16

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 3-7 Setup > Units.

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.

Water surface

Depth of transducer

Negative 
value

Transducer

Positive 
value

4.  Check the actual amount of fuel used per 

engine by refilling the portable tank(s) to the 
original level and noting the reading(s) from 
the fuel dispenser’s gauge.

5. Select 

Fuel. Use    or    to change the 

reading to match that on the fuel dispenser’s 
gauge. 

6. Press    when the reading is correct.

Keel offset is a depth correction representing the 
vertical distance between the depth transducer and 
the location from which the depth is to be measured.

Enter a positive keel offset value when the 
transducer is located below the water surface but 
the total depth is required.

Enter a negative keel offset value when the 
depth below the deepest part of the boat is 
required (such as the keel, the rudder or the 
propeller) and the transducer is located closer to 
the water surface.

Use the cursor keys to select Keel offset, 
then press    to display the Keel offset box.  

Use the    or    cursor keys to adjust the value.

The sonar displays do not show a fixed distance 
travelled by the boat; rather, they display a 
history, showing what has passed below the boat 
during a certain period of time.

The history of the sonar signal displayed depends 

This section explains how to interpret the sonar 
displays and how fish are detected and displayed.
It also describes Gain and Range and shows 

examples of some of the different sonar displays. 
Also see section 1-2 How the Explorer 435 and 
Explorer 438 works.

the depth of the water and the scroll speed 
setting. 

In shallow water, the echoes have a short distance 
to travel between the bottom and the boat. In 
deep water, the history moves across the display