Defining a partial guard zone, Radar targeting and marpa, Marpa targeting symbols – Garmin GPSMAP 8530 Black Box User Manual
Page 19: Assigning a marpa tag to an object, Viewing information about a marpa-tagged object, Removing a marpa tag from a targeted object, Viewing a list of ais and marpa threats, Showing ais vessels on the radar screen, Vrm and ebl, Showing the vrm and the ebl
