Furuno FEA-2807 - Lost AIS Target Alarm; How to Display True or Relative Speed Vectors

21. AIS Target Functions
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21.8 Lost AIS Target Alarm
A lost AIS target is indicated with an X through the AIS target symbol. When alert "633: Lost AIS target" is
acknowledged, AIS symbol will be removed from display. If alert "633: Lost AIS target" is not acknowledged in a
certain time, lost AIS target symbol will be automatically removed from display. For details, see section "21.1.
Introduction" .
1. Put the cursor on the text "Lost target alarm" then left-click to select desired option (OFF, FILT, ALL).
2. For FILT, you can set additional conditions for lost AIS target. Put the cursor on the text "Lost TGT alarm" then
right-click to open the CPA auto activate dialog box. Set desired additional conditions for lost AIS targets in the
AIS field (Max range, Min. ship speed, Exclude class B and Min. ship length).
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21.9 How to Display True or Relative Speed Vectors
AIS target’s relative vector is displayed relative to your ship's velocity vector,
RVECT, ground stabilized relative to own ship, which means that the own
ship velocity vector disappears and the target vectors are the result of target
and own ship course and speed. True speed vector modes are TVECT (G),
true ground stabilized or TVECT (S), true sea stabilized.
Vector time (or the length of vectors) and mode can be set on the status bar, at
the locations circled in the illustration below.