User manual NAVMAN FISHFINDERS FISH 4500

[. . . ] F I TRACKFISH /4600 S H 4 5 0 0 6600 CHA RTPLOTTER AND FISHFINDERS FISHFINDER Installation and Operation Manual English . . . . . . . . . . . . . . . . . 75 www. navman. com NAVMAN This is the Installation and Operation manual for the Navman FISH 4500 and FISH 4600 (here after referred to as FISH 4500/4600) ¿sh¿nders. The FISH 4500/4600 is set up with default units of feet, °F (Fahrenheit), US gallons and knots. See section 3-6 Setup > Units, to change the units. FCC Statement Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. [. . . ] If there is a current, the fish will often be found downstream of the feature. When fishing with the FISH 4500/4600 with the Fish symbols Off, a weak fuzzy band may appear between the bottom trace and surface. This might indicate a thermocline - a rapid change in water temperature, such as the edge of a warm or cold current. The temperature difference can form a barrier which the fish may not swim through. In fresh water, fish often collect around a thermocline. Fish symbols Off For experienced users this always provides the best information as every echo is displayed, whether it is surface clutter, a thermocline or a fish. The picture in section 4-1 Interpreting the display, shows the Sonar display with the Fish symbols Off. The fish appear as arches. Fish arches In good conditions and with Fish symbols Off, a fish passing through the cone-shaped ultrasonic pulse is displayed as a fish arch. A fish arch occurs when a fish enters the weak edge of the sonar cone, generating a weak echo that is displayed as the first pixel of the fish arch. As the fish moves closer to the middle of the cone, the distance between the transducer and the fish reduces and the echo is displayed at progressively shallower depths, producing the start of an arch. When the fish passes directly beneath the middle of the cone, the echo becomes strongest and thickest. As the fish passes out of the middle of the cone the reverse happens with a progressively weaker and deeper echo. For example: · 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. 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. · 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. 19 Fish symbols The fish symbol can be customized or switched off altogether so that the echoes are not converted to fish symbols on the display. The differences between Fish symbol On and Off are: Fish symbols On Using Navman's SBN-II sonar technology the fishfinder analyses all echoes and eliminates most false signals and clutter so that remaining targets are most likely fish. Depending on the strength of the remaining echoes, they are displayed as either small, medium or large fish symbols - with or without depth. 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 following picture shows the Sonar display with the Fish symbol: On + depth: FISH 4500/4600 Installation and Operation Manual NAVMAN 4-4 Gain Gain (sensitivity) controls the amount of detail displayed on the FISH 4500/4600. [. . . ] Guangzhou, Hong Kong, Dalian, Qingdao, Shanghai 1701 Yanjiang Building 195 Yan Jiang Zhong Rd. Ph: +86 20 3869 8839 Fax: +86 20 3869 8780 e-mail: sales@peaceful-marine. com web: www. peaceful-marine. com India Access India Overseas Pvt. Ph: +91 120 244 2697 TeleFax: +91 120 253 7881 Mobile: +91 98115 04557 e-mail: vkapil@del3. vsnl. net. in Esmario Export Enterprises Block No. Ph: +91 40 2784 5163 Fax: +91 40 2784 0595 e-mail: gjfeee@hd1. vsnl. net. in web: www. esmario. com Korea Kumhomarine Technology Co. [. . . ]