User manual NORTHSTAR EXPLORER 457

[. . . ] Explorer 457/467 Fishfinder Installation and Operation Manual www. northstarnav. com IMPORTANT SAFETY INFORMATION Please read carefully before installation and use. DANGER !It is used to alert you to potential personal injury hazards, Obey all safety messages that follow this symbol to avoid possible injury or death. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury CAUTION indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage. [. . . ] Economy The distance travelled per unit of fuel used. The value can depend on the type of speed sensor (see section 7-5). 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 optimise boat performance (see section 7-6). 7-3 When you add or remove fuel When you add or remove fuel, you must tell the 457/467, otherwise the fuel data will be meaningless. A When you completely fill a tank Go to the fuel window and press 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 partially fill a tank 1 2 3 4 Add fuel to a tank and write down how much fuel you add. From the Fuel window, press select Add fuel. and On a multi-tank boat, select the tank that you have added fuel to. Change the number to the amount of fuel that you added. 31 Northstar FISH 457/467 Installation and Operation Manual 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. Before removing fuel, go to the Fuel window, press and select Set remaining. On a multi-tank boat, select the tank that you are removing fuel from. Write down the value of Remaining for the tank; this is the amount of fuel originally in the tank. 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. Change the number on the Set Remaining menu to the amount of fuel that you calculated was now in the tank. [. . . ] This may cause the 457/467 to automatically decrease the Gain unless using Manual Gain. b a The 457/467 thus eliminates weaker signals such as fish or even the bottom from the display. This may be checked by switching off other instruments, accessories (e. g. bilge pump) and the motor until the offending device is located. [. . . ]