Garmin GPSMAP 820 Owner's Manual - Page 26

NOTE: Depending upon the radar in use, the rain clutter settings configured for use in one radar mode may or may not be applied to other radar modes or to the Radar overlay. 1 From a Radar screen or the Radar overlay, select MENU > Noise Rejection > Rain Clutter. 2 Select Up or Down to decrease or increase the appearance of nearby rain clutter until other targets are clearly visible on the Radar screen. Clutter caused by rain may still be visible. Reducing Cross Talk Clutter on the Radar Screen You can reduce the appearance of clutter caused by interference from another nearby radar source, when the cross talk reject setting is on. NOTE: Depending upon the radar in use, the cross talk reject setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar overlay. From a Radar screen or the Radar overlay, select MENU > Noise Rejection > Cross Talk Reject. Radar Display Settings From any Radar screen or the Radar overlay, select MENU > Radar Setup. Orientation: Sets the perspective of the radar display. The orientation setting applies to every radar mode. This setting does not apply to the Radar overlay. Appearance: Sets the color scheme, look-ahead speed, and navigation appearance. Front of Boat: Compensates for the physical location of the radar scanner on a boat, if the radar scanner does not align with the bow-stern axis. Radar Appearance Settings From a Radar screen, select MENU > Radar Setup > Appearance. NOTE: These settings do not apply to the Radar overlay. Color Scheme: Sets the color scheme. Look-Ahead Speed: Shifts your present location toward the bottom of the screen automatically as your speed increases. Enter your top speed for the best results. Heading Line: Shows an extension from the bow of the boat in the direction of travel on the radar screen. Rings: Shows the range rings that help you to visualize distances on the radar screen. Nav. Lines: Shows the navigation lines that indicate the course you have set using Route To, Guide To, or Go To. Waypoints: Shows waypoints on the radar screen. Front-of-Boat Offset The front-of-boat offset compensates for the physical location of the radar scanner on a boat, if the radar scanner does not align with the bow-stern axis. Measuring the Potential Front-of-Boat Offset The front-of-boat offset compensates for the physical location of the radar scanner on a boat, if the radar scanner does not align with the bow-stern axis. 1 Using a magnetic compass, take an optical bearing of a stationary target located within viewable range. 2 Measure the target bearing on the radar. 3 If the bearing deviation is more than +/- 1°, set the front-of- boat offset. Setting the Front-of-Boat Offset Before you can set the front-of-boat offset, you must measure the potential front-of-boat offset. The front-of-boat offset setting configured for use in one radar mode is applied to every other radar mode and to the Radar overlay. 1 From a Radar screen or the Radar overlay, select MENU > Radar Setup > Front of Boat. 2 Select Up or Down to adjust the offset. Digital Selective Calling Networked Chartplotter and VHF Radio Functionality If you have a NMEA 0183 VHF radio or a NMEA 2000 VHF radio connected to your chartplotter, these features are enabled. • The chartplotter can transfer your GPS position to your radio. If your radio is capable, GPS position information is transmitted with DSC calls. • The chartplotter can receive digital selective calling (DSC) distress and position information from the radio. • The chartplotter can track the positions of vessels sending position reports. If you have a Garmin NMEA 2000 VHF radio connected to your chartplotter, these features are also enabled. • The chartplotter allows you to quickly set up and send individual routine call details to your Garmin VHF radio. • When you initiate a man-overboard distress call from your radio, the chartplotter shows the man-overboard screen and prompts you to navigate to the man-overboard point. • When you initiate a man-overboard distress call from your chartplotter, the radio shows the Distress Call page to initiate a man-overboard distress call. Turning On DSC Select Settings > Other Vessels > DSC. DSC List The DSC list is a log of the most recent DSC calls and other DSC contacts you have entered. The DSC list can contain up to 100 entries. The DSC list shows the most recent call from a boat. If a second call is received from the same boat, it replaces the first call in the call list. Viewing the DSC List Before you can view the DSC list, the chartplotter must be connected to a VHF radio that supports DSC. Select Nav Info > Other Vessels > DSC List. Adding a DSC Contact You can add a vessel to your DSC list. You can make calls to a DSC contact from the chartplotter. 1 Select Nav Info > Other Vessels > DSC List > Add Contact. 2 Enter the Maritime Mobile Service Identity (MMSI) of the vessel. 3 Enter the name of the vessel. Incoming Distress Calls If your compatible chartplotter and VHF radio are connected using NMEA 0183 or NMEA 2000, your chartplotter alerts you when your VHF radio receives a DSC distress call. If position information was sent with the distress call, that information is also available and recorded with the call. designates a distress call in the DSC list and marks the position of the vessel on the Navigation chart at the time of the DSC distress call. 20 Digital Selective Calling