User manual NORTHSTAR 490 ECHOSOUNDER

[. . . ] Northstar 490 Echo Sounder Operations Manual Limited warranty policy Northstar Technologies, Inc. warrants the Northstar 490 to be free from defects in materials and workmanship for a period of two (2) years. This warranty applies to the original purchaser and to any subsequent owner during the warranty period, which begins on the date of shipment of the unit, F. O. B. Systems may not be returned to Northstar without a Returned Materials Authorization (RMA) number. [. . . ] At the NOISE LIMITER window, press the CURSOR PAD up to turn the noise limiter on (or press NOISE LIMITER again). Press the RETURN key to go back to the ECHO screen. Turning the noise limiter on changes a portion of the PICTURE key tab from green to yellow, as a reminder. 490 Echo Sounder Operations Manual Rev. B2 Page 3-5 Chapter 3 - Adjusting the Echo Sounder Picture Selecting the color bar (hue) and white level Understanding the color bar The color bar displayed at the extreme left of the ECHO screen shows the range of colors used to display different echo strengths. Weaker echoes are displayed with colors near the bottom of the scale, and stronger echoes are displayed with colors near the top. You can choose any one of nine palettes of colors to represent the echo strengths from weakest to strongest. · · · · Color bar #1 is the one most often used. Color bar #2 is similar but with fewer colors, to aid visibility under some conditions. Color bars # 3-8 are additional variations with different background colors. Color bar #9 uses only a single color, ranging from very dark to very bright. Selecting the color bar (hue) To select the color bar: 1. At the HUE AND WHITE LEVEL window, press the CURSOR PAD left or right to select the color bar desired, or use the KEYPAD to manually enter the number of the color bar. Page 3-6 490 Echo Sounder Operations Manual Rev. B2 Chapter 3 - Adjusting the Echo Sounder Picture Hue and white level window 4. Press RETURN to go back to the ECHO screen. Setting the white level You can replace any single color in the color bar with white. On the HUE AND WHITE LEVEL window, press the CURSOR PAD up or down to select that color. To remove the white level and return to using all the colors on the color bar, press the CURSOR PAD down until the white level moves off the color bar. 490 Echo Sounder Operations Manual Rev. B2 Page 3-7 Chapter 3 - Adjusting the Echo Sounder Picture Page 3-8 490 Echo Sounder Operations Manual Rev. 4-4 chapter explains how to override the system's automatic depth settings and manually control the depth range shown on the screen, and how to use the depth marker. This 490 Echo Sounder Operations Manual Rev. B2 Page 4-1 Chapter 4 - Understanding Depth Settings Viewing the seabed depth The seabed depth (the "bottom") is displayed in a black box at the left edge of the ECHO screen. You can change the size and location of the depth box on the ECHO screen. There are four available sizes: · · · · small medium large huge To resize the depth box or move it up or down: 1. The depth box can also be adjusted by pressing MORE, then pressing DATA. Viewing the depth marker You can use the depth marker to accurately measure the depth of an echo. To display the depth marker--a dashed horizontal line--and move this marker up or down, press the CURSOR PAD down. Attached to the depth marker line is a small black box, which displays the marker's exact depth. [. . . ] To clean a transducer of sand, debris, or sea growth, use a stiff brush or putty knife. Use sanding sparingly, as repeated sanding may affect a transducer's performance at high speeds. Check the transducer periodically. Page 8-4 490 Echo Sounder Operations Manual Rev. B2 490 Features and Specifications Table 4: 490 echo sounder features Performance characteristics 490-S 490-D Alarms Update rate Auto modes Zoom modes Features Single Channel, 50/200kHz, 600W Dual Channel, 50/200, 1kW Fish, seabed, temperature 10 Hz maximum (depends on water depth) Fishing and cruising Marker, bottom, bottom lock, bottom lock/center Mark present or past echo as waypoint (961/962) Go directly to any past echo A-scope analyzes present or past echoes Navigation data shown at bottom of screen Demo mode for training 490 Echo Sounder Operations Manual Rev. [. . . ]