User manual NORTHSTAR EXPLORER 443D

[. . . ] Explorer 443d/443df 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 avoidpossible 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. WARNING CAUTION CAUTION DISCLAIMER: It is the owner's sole responsibility to install and use the instrument and transducers in a manner that will not cause accidents, personal injury or property damage. [. . . ] While the SBN-II processing is very sophisticated it is not foolproof - there will be times when the fishfinder will not be able to differentiate between large air bubbles, rubbish containing air, fishing floats etc. The picture shows the Sonar display with the Fish symbol: symbol + depth: Poor transducer installation (see Transom Transducers Installation Guide). If the boat is anchored then fish will tend to show on the display as horizontal lines as they swim into and out of the transducer sonar beam. Slow speeds in deeper water give the best fish arch returns. It will be much easier to see fish arches when using zoom mode to concentrate on a particular section of water, rather than just displaying everything from the surface to the bottom. Zooming increases screen resolution and is necessary for good fish arches. · Northstar Explorer 443d/443df Installation and Operation Manual 21 · It is difficult to get fish arches in shallow water as the transducer sonar beam is very narrow near the surface and fish do not stay within the beam long enough to display an arch. Several fish in shallow water tend to display as randomly stacked blocks of pixels. Wave motion may result in distorted fish arches · 4-4 Gain Gain (sensitivity) controls the amount of detail displayed on the Explorer 443d/443df. Understanding how to set suitable Gain settings is important for optimum performance. The Northstar fishfinder has three gain modes, Cruising, Fishing and Manual. · Cruising Mode Use this mode to show only the bottom and large fish. Fishing Mode Use this mode to show as much detail as possible. Manual Mode The gain can be adjusted by the user to compensate for water depth and clarity. Note: The Gain mode automatically changes to Manual Gain if the gain or threshold settings are adjusted by the user. · Obtaining the best results To obtain the best detection capability for both fish and bottom we recommend the use of the Sonar A-Scope display: 1. Adjust the gain until the threshold line is just to the right of the unwanted noise. · High Gain settings may amplify the normal background noise until it appears as random pixels. Changing between Cruising, Fishing and Manual To change between Cruising, Fishing and Manual 1. Use the or cursor keys to highlight mode option, then use the cursor key then select desired option from list. Unwanted signal Gain Threshold line Adjusting Gain and Threshold settings The gain settings and the threshold settings can be adjusted independently for each frequency (83kHz and 200 kHz). Use threshold to eliminate colors in the sonar display. Use the or cursor keys to highlight the desired setting, then use the cursor key to change it. Gain line 22 Northstar Explorer 443d/443df Installation and Operation Manual 4-5 Range Range is the vertical depth displayed on the Explorer 443d/443df. The Northstar fishfinder has two range modes, Auto Range and Manual Range: · Zoom Range and Zoom Offset On the Sonar Zoom and Sonar Bottom displays, a vertical bar is shown on the far right of the display. The zoom bar shows the zoom range; that is, the area that is magnified. [. . . ] c) The Set remaining fuel value must be reset after every refuelling (see section 3-3 Setup > Fuel). d) The fuel tank may not refill to the same capacity each time due to air pockets. This is particularly noticable with underfloor tanks. e) Fuel transducers wear out over time and should be replaced after every 5000 litres of fuel. Flow indicates no fuel or low fuel: a) Check that the number of engines is set to 1. [. . . ]