3. STEERING MODES

SPIRAL

The boat will spiral in the direction of current heading (STBY), set course (AUTO) or the course to the next waypoint (NAV) that was active at the moment that the SPIRAL mode is selected. The radius of the “spiral” can be set in the menu. This is same as RADIUS OF ORBIT.

In the NAV mode, the boat steers toward the waypoint (s) spirally. Note that the NMEA0183 sentence AAM is required from the plotter, and the arrival alarm range must also be set on the plotter.

Note 1: In the NAV mode, the SPIRAL deactivates the manual waypoint switching. (See paragraph 3.3.3.)

Note 2: If the boat does not enter the arrival alarm area, it may not be switched to the next waypoint. Set the arrival alarm range as large as possible and activate the perpendicular function on the plotter connected.

The boat will continue to orbit until the [AUTO] or [STBY] key is pressed.

SPIRAL starting position

d (radius of orbit)

Orbit of the center of spiral

L

(Distance between centers of spirals, see next page.)

Example of spiral maneuver in turn mode

To execute the spiral, do the following.

1.Press the [MENU] key to show the main menu.

2.For AUTO or NAV mode, rotate the course control knob to select the “SPIRAL SPEED.”

For STBY mode, select “PARAMETER SETUP” in the main menu, and then press the course control knob to show the PARAMETER SETUP menu. Select “SPIRAL SPEED” in there.

3.Press the course control knob.

The current value is circumscribed with a double rectangle.

4.Rotate the course control knob to set the spiral speed (Setting range: 0.1 to 8.0 kt.), and then press the [MENU] key twice in that order.

Refer to the formula in below to set the radius of orbit and spiral speed.

6.28 d (radius of orbit: nm)

Vc (spiral speed: kt)

L (distance between centers of spiral: nm) =

Vs (ship’s speed : kt)

3-12

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Furuno 500 manual Spiral, Example of spiral maneuver in turn mode
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500 specifications

Furuno 500 is a high-performance marine radar system that represents the forefront of maritime navigation technology. Designed for both commercial and recreational vessels, the Furuno 500 combines advanced radar capabilities with user-friendly features, providing mariners with accurate situational awareness on the water.

At the core of the Furuno 500’s performance is its high-definition radar display. Utilizing a powerful processor, it delivers crisp imagery and enhanced target detection, even in challenging conditions. The 12-inch or 15-inch LED display ensures visibility in bright sunlight while accommodating multiple viewing modes. The radar can switch between various settings, such as long-range scanning and short-range detail, providing flexibility based on navigation needs.

One of the standout features of the Furuno 500 is the advanced Target Tracking technology. This system allows mariners to monitor multiple targets simultaneously, enhancing safety during navigation. With features like Automatic Radar Plotting Aid (ARPA), the radar can predict the movement of vessels and assist in collision avoidance, offering peace of mind while navigating busy waterways.

Furuno has also integrated digital signal processing (DSP) into the 500 series, which enhances the radar’s ability to filter out noise and clutter. This means users can rely on a clear, precise image without distractions that could impact decision-making. Enhanced target resolution helps in identifying various objects and provides essential data for safe navigation.

The Furuno 500 is also compatible with various networking options, allowing easy integration with other onboard systems such as GPS, AIS, and multifunction displays. This connectivity is crucial for modern vessels, enabling a holistic approach to navigation by consolidating information into a single interface.

In addition to its robust technical features, the Furuno 500 is designed for durability and ease of use. The intuitive menu layout and simplified controls allow mariners of all skill levels to operate the system effectively. Its rugged construction ensures reliable performance in harsh marine environments, making it suitable for both commercial applications and leisure crafts.

In summary, the Furuno 500 radar system offers cutting-edge technology combined with practical features that enhance navigational safety and efficiency. Whether navigating busy ports or remote waters, this sophisticated system caters to the needs of modern mariners, making it an essential tool for any serious vessel.
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