• | Range Rings This function enables range rings to be shown on the ST90 presentation. Range rings are a set of concentric circles labelled by distance from the vessel position. The range rings are shown as dotted lines. Each ring has a range read-out on the left hand side. Use this function to toggle the range rings On or Off.
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• | Variable Range Ring An adjustable range ring can be added to the Horizontal and Vertical views. The ring is shown as a dotted circle with its centre on the vessel symbol. The current range is shown next to the circle. To change the range, left-click on the circle and drag to requested diameter. You can use VRR Range to manually define a range. The variable range ring can be used for any type of distance measurement relative to the vessel.
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• | VRR Range (Variable Range Ring Range) You can use VRR Range to manually define a range for the variable range ring.
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• | Compass Cards Activate Compass Cards to place evenly spaced compass markers on the outer range ring in horizontal views. The compass markers rotate based in the inputs from a navigation sensor. An update takes place when the vessel heading changes more than 1 degree.
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• | Depth Dividers Depth dividers are horizontal dotted lines used to indicate depth. You can only add these lines to vertical views. Use this function to toggle the depth divider lines On or Off.
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• | Coverage Plot When you operate with sector transmissions, the area covered by the sonar beams is limited by the chosen transmit sector angle. To make it easier to recognize the area limits, dedicated border lines may be added to the presentation. These lines are used to outline the sector. Use this function to toggle the coverage plot lines On or Off.
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• | Purse Depth A line of X’es in the vertical views shows the bottom of the purse seine. The depth is defined for the fishing gear you have chosen. Use Purse Depth on the Cosmetics menu to toggle this line On or Off.
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