Garmin GPSMAP 7400 Series Owner's Manual

Also see for GPSMAP 8000 Series: Owner's manual Quick start manual Instructions Owner's manual Installation instructions

Contents

Garmin GPSMAP 7400 Series Owner's Manual Manual pdf 28 page image

dangerous), and the chartplotter can sound a collision alarm ifthe object enters your safe zone.MARPA Targeting SymbolsAcquiring a target. Concentric, dashed green rings radiate fromthe target while the radar is locking onto it.Target has been acquired. A solid green ring indicates thelocation of a target that the radar has locked onto. A dashedgreen line attached to the circle indicates the projected courseover ground or the GPS heading of the target.Dangerous target is in range. A red ring flashes from the targetwhile an alarm sounds and a message banner appears. Afterthe alarm has been acknowledged, a solid red dot with a dashedred line attached to it indicates the location and the projectedcourse over ground or the GPS heading of the target. If the safe-zone collision alarm has been set to Off, the target flashes, butthe audible alarm does not sound and the alarm banner doesnot appear.Target has been lost. A solid green ring with an X through itindicates that the radar could not lock onto the target.Closest point of approach and time to closest point of approachto a dangerous target.Assigning a MARPA Tag to an ObjectBefore you can use MARPA, you must have a heading sensorconnected and an active GPS signal. The heading sensor mustprovide the NMEA 2000 parameter group number (PGN)127250 or the NMEA 0183 HDM or HDG output sentence.1 From the Harbor, Offshore, or Cruising Radar screen, selectan object or location.2 Select Acquire Target > MARPA Target.Viewing Information about a MARPA-tagged ObjectYou can view the range, bearing, speed, and other informationabout a MARPA-tagged object.1 From a radar screen, select a targeted object.2 Select MARPA Target.Removing a MARPA Tag from a Targeted Object1 From the Radar screen, select a MARPA target.2 Select MARPA Target > Remove.Viewing a List of AIS and MARPA ThreatsFrom any Radar screen or the Radar overlay, you can view andcustomize the appearance of a list of AIS and MARPA threats.1 From a Radar screen, select Menu > Other Vessels > List >Show.2 Select the type of threats to include in the list.Showing AIS Vessels on the Radar ScreenAIS requires the use of an external AIS device and activetransponder signals from other vessels.You can configure how other vessels appear on the Radarscreen. If any setting (except the AIS display range) isconfigured for one radar mode, the setting is applied to everyother radar mode. The details and projected heading settingsconfigured for one radar mode are applied to every other radarmode and to the Radar overlay.1 From a Radar screen or the Radar overlay, select Menu >Other Vessels > Display Setup.2 Select an option:• To indicate the distance from your location within whichAIS vessels appear, select Display Range, and select adistance.• To show details about AIS-activated vessels, selectDetails > Show.• To set the projected heading time for AIS-activatedvessels, select Proj. Heading, and enter the time.• To show the tracks of AIS vessels, select Trails, andselect the length of the track that appears.VRM and EBLThe variable range marker (VRM) and the electronic bearing line(EBL) measure the distance and bearing from your boat to atarget object. On the Radar screen, the VRM appears as a circlethat is centered on the present location of your boat, and theEBL appears as a line that begins at the present location of yourboat and intersects the VRM. The point of intersection is thetarget of the VRM and the EBL.Showing the VRM and the EBLThe VRM and the EBL configured for one mode are applied toother radar modes.NOTE: The VRM and the EBL cannot be changed in sentrymode.From a radar screen, select Menu > Show VRM/EBL.Adjusting the VRM and the EBLBefore you can adjust the VRM and the EBL, you must showthem on the Radar screen (Showing the VRM and the EBL).You can adjust the diameter of the VRM and the angle of theEBL, which moves the intersection point of the VRM and theEBL. The VRM and the EBL configured for one mode areapplied to all other radar modes.1 From a Radar screen, select a new location for theintersection point of the VRM and the EBL.2 Select Drop VRM/EBL.3 Select Stop Pointing.Measuring the Range and Bearing to a Target ObjectBefore you can adjust the VRM and the EBL, you must showthem on the Radar screen (Showing the VRM and the EBL).1 From a Radar screen, select the target location.2 Select Measure Distance.The range and the bearing to the target location appear in theupper-left corner of the screen.Radar OverlayWhen you connect your chartplotter to an optional Garminmarine radar, you can use the Radar overlay to overlay radarinformation on the Navigation chart or on the Fishing chart.The Radar overlay superimposes radar information on theNavigation chart or the Fishing chart. Data appears on theRadar overlay based on the most recently used radar mode(such as Harbor, Offshore, or Sentry), and all settingsconfigurations applied to the Radar overlay are also applied tothe last-used radar mode. For example, if you use Harbor modeand then you switch to the Radar overlay, the Radar overlaywould show Harbor mode radar data. If you changed the gainsetting using the Radar overlay menu, the gain setting forHarbor mode would change automatically.Radar Overlay and Chart Data AlignmentWhen using the Radar overlay, the chartplotter aligns radar datawith chart data based on the boat heading, which is based bydefault on data from a magnetic heading sensor connectedusing a NMEA 0183 or NMEA 2000 network. If a heading sensoris not available, the boat heading is based on GPS trackingdata.GPS tracking data indicates the direction in which the boat ismoving, not the direction in which the boat is pointing. If the boatis drifting backward or sideways due to a current or wind, theRadar overlay may not perfectly align with the chart data. Thissituation should be avoided by using boat-heading data from anelectronic compass.If the boat heading is based on data from a magnetic headingsensor or an automatic pilot, the heading data could becompromised due to incorrect setup, mechanical malfunction,magnetic interference, or other factors. If the heading data is22 Radar