Marpa; Fast Scan; North Indicator - Lowrance HDS Gen2 Touch Operator's Manual

Threshold
The threshold sets required signal strength for the lowest radar
signals. Radar returns below this limit will be filtered and not
displayed. The default value is 30%.

Fast scan

(Broadband Radar™ only).
Increases the rotation speed of the radar scanner when the range is
under 2nm. This option gives faster updates on target movements
within this range.

North indicator

Turns on/off viewing of the North indicator on the radar page.
Range rings
Turns on/off viewing of Range rings on the radar page.
Range markers
Turns on/off viewing of Range markers on the radar page. Range
rings must be turned on before Range markers can be enabled.
Compass
Turns on/off viewing of the compass overlay on the radar page.
Bearings
Used to select whether bearing will be measured in relation to True
Magnetic North or your Relative heading.

MARPA

If your system includes a heading sensor that is connected to the
radar, MARPA function (Mini Automatic Radar Plotting Aid) can be
used to track up to ten radar targets.
MARPA tracking is an important tool for collision avoidance.
¼ Note:
You must have a heading sensor connected to your system to
use MARPA.
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Radar | Lowrance HDS Gen2 Touch