GPSMAP® 6000/7000 Series Owner’s Manual 77Radar3. Adjust the size of the guard zone:• For the GPSMAP 6000 series, use the Rocker and the on-screen arrows( and ).• For the GPSMAP 7000 series, touch the guard-zone corner and drag.4. Select Corner 2 and repeat step 3 to adjust the location of the second corner of the guardzone.5. Select Done.Radar TargetingRadar targeting enables you to identify and track objects.About MARPAMARPA is primarily used for collision avoidance, through object targeting and tracking.To use MARPA, you must assign a MARPA tag to a target. The radar system automatically monitors thetagged object and provides you with information about the object, including the range, bearing, speed, GPSheading, nearest approach, and time to nearest approach. MARPA indicates the status of each tagged object(acquiring, lost, tracking, or dangerous), and the chartplotter can sound a collision alarm if the object entersyour safe zone.MARPA TargetingAcquiringMARPA targetTrackingMARPA targetLost MARPAtargetDangerousMARPA targetClosest point andtime of approachto dangerousMARPA targetMARPA Targeting SymbolsSymbol DescriptionAcquiring a target� Concentric, dashed green rings radiate from the target while the radar is lockingonto it�Target has been acquired� A solid green ring indicates the location of a target that the radar haslocked onto� A dashed green line attached to the circle indicates the projected course over groundor the GPS heading of the target�Dangerous target is in range� A red ring flashes from the target while an alarm sounds and amessage banner appears� After the alarm has been acknowledged, a solid red dot with a dashedred line attached to it indicates the location and the projected course over ground or the GPSheading of the target� If the safe-zone collision alarm has been set to Off, the target flashes, but theaudible alarm does not sound and the alarm banner does not appear (page 17)�Target has been lost� A solid green ring with an X through it indicates that the radar could not lockonto the target�Closest point of approach and time to closest point of approach to a dangerous target�Circular