Using Radar

MARPA Target (only appears when you are targeting a tagged MARPA object)—opens the MARPA target information window.

Lost MARPA target

Tracking MARPA target

Closest point and time of approach to dangerous MARPA target

Dangerous

MARPA target

Acquiring

MARPA target

MARPA Targeting

Understanding the Radar Overlay Screen

Use the Radar Overlay option to overlay radar information on the Navigation chart.

Radar range

Using Radar

From the Home screen select Radar > Radar Overlay. The radar picture appears in orange and overlays the Navigation chart. Use the RANGE (+/-) keys (GPSMAP 4000 series) or the and keys (GPSMAP 5000 series) to zoom in and out. Zooming while panning the map only affects the zoom scale of the map. The radar range remains the same. Zooming while the map is locked on the boat (not panning) affects the zoom scale of the map and the radar range.

To access additional settings or options for the radar overlay screen, select Menu. Select Setup > Chart Setup to access the chart options. Select Radar Setup to return to the radar setup options.

Obtaining Optimal Radar Display Performance

The gain controls the sensitivity of the radar receiver. The default setting for the gain, Auto, adjusts the gain automatically to provide the best performance.

To adjust the gain:

1.Select Menu > Gain on the radar screen.

2.Select Up or Down to manually adjust the gain; select Auto to return the gain to the default setting.

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GPSMAP® 4000/5000 Series Owner’s Manual