Furuno FSV84BB SONAR, Black Box Sonar, Omni SONAR, 73.5-86.5 kHz The Furuno FSV84BB Sonar is a new black box, full-circle color scanning sonar that offers high resolution image in all ranges. Its detection range capability has been improved significantly compared to conventional scanning sonar utilizing an equal frequency. To enhance fishing operations, images are presented in a variety of ways including dual-portrait, dual-landscape and inset modes.
A variety of presentation modes are available for efficient fishing operations. Adding to conventional presentation modes such as full circle and vertical mode, the Furuno FSV84 features a new Dual Full Scan mode which simultaneously shows two full-circle scans at different tilt angles or ranges, as well as the new Slant mode for 180-degree half-circle fan picture. Viewing the fishing grounds from various perspectives helps the skipper to detect fish school faster, find the most lucrative areas, and to grasp the timing of the net shooting. In addition, FSV84 features advanced functions such as Auto Filter and a stabilization system for skippers to observe targets even in foul weather conditions. With its user-friendly interface, often-used functions can be enabled in one touch.
Dual Full-Circle Scan
Full-circle scan can be set at the bearing of horizontally -5 degrees to 90 degrees under the vessel. Additionally, the dual full circle scan modes simultaneously show two full-circle scans at different tilt angles or ranges selected by the operator. Viewing the fish schools from far and near ranges simultaneously permits the skipper to compare between the two different targets. It’s like having two sonars on one screen!
Combination Full-Circle + Vertical Scan
Adding to full-circle scan, the vertical scan can be displayed to show a directional scan image of the selected bearing. The vertical scan setting can be adjusted simply by using the trackball to place the marker at the desired location on the full-circle display and pressing a key.
By utilizing both scans, the skipper can obtain location of fish schools and fish distribution in horizontal and vertical perspectives simultaneously. This feature is extremely helpful to determine the spread of fish schools or to locate the most concentrated part of the target, eliminating the need to travel over the school to see its distribution on the echosounder.
Slant Mode Scan
The Slant mode shows a 180-degree cross section using chosen tilt angle and train setting. Slant mode is useful for detecting bottom fish, monitoring changing bottom conditions, and identifying the location of trawling activity. Purse seiners can also use this mode for observation of fish behavior and school structure in the net so that fish do not leave the purse before catching. The sonar beam can be tilted to 90 degrees under the vessel and rotate 360 degrees, offering a detailed scan image of the whole sea area around the vessel with no blind spots.
Suppressing Bottom and Surface Reflection
In shallow fishing grounds with hard or rocky bottom, bottom reflections often interfere with desired fish echoes, and often they cannot be eliminated sufficiently with gain controls. In this situation, the output power can be reduced by adjusting the Tx output. Using this method is more effective than relying on GAIN adjustments only as the picture can become much clearer with the reduction of output power.
Beam Stabilization
Thanks to FSV84’s built-in motion sensor, the beam stabilization mode maintains the sonar beam at required tilt by compensating for ship's pitching and rolling. This gives an unwavering presentation of the echo images even in rough seas.
