Raymarine LIGHTHOUSE 3 Advanced Operation Instructions page 274

Once acquired the target's COG (Course Over Ground) and SOG (Speed Over Ground) can be
displayed below the target ID.
The Target info is colored Blue if COG and SOG values are True or Orange if values are Relative.
Target info will turn Red if the target becomes dangerous.
Acquiring a target manually
To acquire a Radar target manually using MARPA (Mini Automatic Radar Plotting Aid) follow the
steps below.
1. Select the object / target.
The context menu is displayed.
2. Select Acquire target.
Once acquired the target will be tracked.
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Acquiring target
(manual) — Thin
dashed Green circle
Acquiring target (auto)
— Thick dashed Red
circle, flashes until
acknowledged
Dangerous target
— Red circle with
Target ID, flashes until
acknowledged
Acquired target
(manual) — Green
circle with Target ID
Unacknowledged
acquired target (auto)
— Red circle, flashes
until acknowledged
Lost target (Target not
detected for 4 Radar
scans) — Gray circle
with Red cross through