User manual NAVMAN 8120

[. . . ] Datahelm 8120 Installation and Operation Manual www. navman. com Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1-1 Overview . 8 2 Basic Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2-1 Using the keys . 13 3 Navigation: Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4 Video window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] To avoid this, completely fill the tank and follow procedure A about every tenth time you add fuel. C When you remove fuel Repeat procedure B, but subtract the fuel you have removed from the original amount of fuel in the tank to calculate the amount of fuel now in the tank. 46 8120 Installation and Operation Manual 13-2 Fuel window To go to the Fuel window, press DISPLAY , select Other, then select Fuel. The window is different if engine RPM is available (requires SmartCraft or diesel sensors to be installed): The Fuel window shows Used The fuel used during a trip. When you want to start measuring how much fuel is used, press SETUP , select Fuel and select Clear used. For twin engine installations, the fuel flow for each engine is shown separately. This is useful for checking that both engines are under the same load. Speed If the Instrument has both GPS and paddlewheel speed available then you can select which to use. The choice affects the calculated Range and Economy (see section 17-5 Speed source). If the Instrument uses a paddlewheel sensor to measure speed, then the speed must be accurately calibrated (to calibrate the Instrument paddlewheel, see section 17-11). The bigger this number, the better the fuel economy Range The estimated boat range at the current fuel flow. 47 8120 Installation and Operation Manual 13-3 Fuel consumption curves A fuel consumption curve is a powerful tool for assessing your boat performance in different conditions and for helping you to run at the most economical speed for the conditions. Fuel consumption curves require engine RPM, which requires SmartCraft or diesel sensors to be installed. 13-3-1 Making a fuel consumption curve Making a fuel consumption curve requires running the boat in a straight line through the engine's full RPM range for about 15 minutes. For your first curve, choose a calm day with light wind and little current; have a typical load and a freshly cleaned hull. Then you can make fuel consumption curves for different boat, weather or sea conditions. Compare these with your first curve to see how your boat's performance changes with conditions. 3 Select Fuel consumption curve, then select New. 6 The Instrument then asks you to set the throttle to achieve a target RPM. When the engine RPMs are correct, the Target RPM box will turn green. Now, do not change the engine speed. Wait for about 60 seconds for the boat to stabilise, ensuring the Target RPM box stays green. 7 The Instrument repeats the above step to record data up to the maximum RPM. Note To interrupt making the curve at any time, press ESC . 4 Enter the comfortable maximum RPM you have measured for the engine. Set the throttle for minimum RPM; for a twin engine boat set both engines to about the same minimum RPM. Wait for about 60 seconds for the boat to stabilise, then press ENTER . Wait while the Instrument records the data. 48 8120 Installation and Operation Manual 13-3-2 Managing fuel consumption curves Record several curves for different conditions. [. . . ] User card - A plug-in card that stores waypoints, routes and tracks (see section 1-2). UTC - Universal Time Coordinated or Coordinated Universal Time, which is a standard world time, formerly called Greenwich Mean Time (GMT). Waypoint - A position that you can set on the Instrument chart, for example a fishing spot or a point on a route (see section 5). Weather - An estimate of the weather based on barometric pressure (requires Navman 7200 VHF radio). 87 8120 Installation and Operation Manual Navigation data The boat is sailing from the start to the destination and has moved off the plotted course from the start to the destination. [. . . ]