Lowrance HDS-9 Gen3 Operators Manual US - Page 114
Sensitivity, MARPA targets, MARPA target symbols
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114 Sensitivity The guard zone sensitivity can be adjusted to eliminate alarms for small targets. MARPA targets If the system includes a heading sensor, the MARPA function (Mini Automatic Radar Plotting Aid) can be used to track up to ten radar targets. You can set alarms to notify you if a target gets too close. Refer to "Radar settings" on page 116. MARPA tracking is an important tool for collision avoidance. Ú Note: MARPA requires heading data for both the radar and the HDS Gen3. MARPA target symbols The system uses the target symbols shown below. Symbol Description Acquiring MARPA target. Typically it takes up to 10 full rotations of the scanner. Tracking MARPA target, not moving or at anchor. Tracking and safe MARPA target with extension lines. Dangerous MARPA target. A target is defined as dangerous when it enters the guard zone defined on the radar panel. When no signals have been received within a time limit a target will be defined as lost. The target symbol represents the last valid position of the target before the reception of data was lost. Selected MARPA target, activated by positioning the cursor on the target icon. The target returns to the default target symbol when the cursor is removed. Radar | HDS Gen3 Operator Manual