The choice, location, angle and installation of the instrument & transducers are critical to
performance of the system as intended. Follow instructions in this manual carefully. If in doubt,
consult your Northstar dealer.
Ensure that any holes cut are in a safe position and will not weaken the boat’s structure. If in doubt,
consult a qualified boat builder.
Do not install plastic through hull transducers in solid wooden hulls. Leaking through the hull may
result.
Do not install bronze transducers in metal hulls. This will cause electrolytic corrosion that may
result in damage to the hull or transducer.
Sonar Performance:
The accuracy of the sonar depth display can be affected by many factors,
including the type and location of the transducer and water conditions. Ensure that the transducer
is located and used correctly.
Fuel Computer:
Do not rely on the fuel computer as the sole source of information regarding
available fuel onboard. Fuel economy can change drastically depending on boat loading and sea
conditions. Fuel Computer information should be supplemented by visual or other checks of the
fuel load. This is necessary due to possible operator errors such as forgetting to reset the fuel used
when filling the tank, running the engine with the Fuel Computer not switched on, or on other
operator actions that may render the device inaccurate. Always carry adequate fuel onboard for
the intended trip, plus a reserve to allow for unforeseen circumstances.
Failure to adhere to these warnings may lead to death, serious injury or property
damage. Northstar disclaims all liability for installation or use of this product that
causes or contributes to death, injury or property damage or that violates any law.
The 457/467 is set up with default units. To change the units, see section 8.6.
Important
