Koden MDC-2900, Operation Manual

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Chapter 3 Primary operations (Menu) MDC-2900 Series
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Reference target acquisition
If SDME or EPFS is not usable by breakdown or any reason, then COG/SOG can be obtained by
setting Reference target.
By tracking 1 or 2 stationary targets, the true speed/the true course can be used.
This stationary tracked target is called as [Reference target].
A letter “R” denoting reference and number are attached to the lower left of Reference target symbol.
Refer to “
TGT ID
” (page3-16)
* Reference target can be used only when COG/SOG is not available.
* HDG input is necessary to use a reference target.
* Reference target has considerable error factor caused by target size, backrush and distance.
Accordingly, if COG/SOG is obtained from the reference target, then its accuracy is generally not
good. It is probable to mistake a moving target for a reference target. Therefore, if a reference target
is used, then CPA/TCPA of TT (ARPA), relative vector and relative speed are prohibited by IEC
62388. For this reason, if a reference target is used, its speed and vector should be only informative.
* Pay attention to that, if a reference target is lost, then accuracy of the true speed/the true course is
significantly reduced.
* The combined use with AIS function cannot be performed.
* If the target is lost for 20 seconds, then reference target function judges as lost target. If a lost target
happens, the numeral indication of COG/SOG is indicated by XXXX symbol in red. Then stabilization
mode automatically changes from ground stabilization to water stabilization.
1
Move cursor using [Track ball] to lay on the target to be acquired.
2
Press [MENU] key to display “Menu”.
Select [OS/TGT] => [TT] => [REF ACQ], and then press [ENT] key.
TRIAL MANOEUVRE
MAP
3
When reference target is tracked, [GYRO] and [REF] windows appear in the own ship information
area at appear right side of the screen.
When [REF] is selected, COG/SOG computed by the reference target can be used.