User's Manual

Chapter 2 Radar Basic Operation MDC-7000P/7900P Series
0093169006-05E 2-20
2 Press MENU key to close menu.
3 Move cursor to the window on the right side of STW MAN on the top right side of the display.
4 Press ENT key to get ready for speed entry. Enter speed by using trackball.
5 Press ENT key to save the input.
GND (Ground stabilization)
GND stabilization uses COG (course over ground) and SOG (speed over ground) referenced to the
ground. Accordingly course and speed indication at the upper right side of the display becomes
COG/SOG.
 SOG is the absolute speed of the ship with reference to the land.
 Two-dimensional GND SDME device like dual axis LOG and EPFS (electronic position fixing
system) provide information for serial input.
 If both serial sentence data of VTG (EPFS) and VBW (SDME) are available, then VBW takes
priority.
 If failure of EPFS or SDME interrupts the speed information for 30 seconds or if the ground status
flag or VTG indicator flag is invalid, then the numerical indication of COG/SOG becomes XXXX in
orange color.
 If SDME or EPFS is not usable due to failure or any other reason, then COG/SOG can be obtained
by setting Reference target.
Refer to 4.3 TT (ARPA) “Reference target acquisition”.
Note: IMO Resolution A.823 (19) ARPAs requires connection to water speed LOG.
In addition, VTG by EPFS or VBW by dual axis LOG should comply with requirements of IMO
Resolution MSC96 (72).