User's Manual

Chapter 2 Radar Basic Operation MDC-5200/5500 Series
0093155002-03 2-20
2.11 Ground and Sea stabilization
STAB MODE is a function to select speed for movement calculation for True trail, TT (ARPA),
Past position and True motion (TM).
1 Press MENU key to display “Menu”.
Select [DISPLAY] => [STAB MODE], and select [SEA] or [GND], and press ENT key.
SEA (Sea stabilization)
SEA stabilization uses CTW (course through water) and STW (speed through water) referenced to
water.
 STW is relative speed of the ship against water surface in the heading direction.
 Information from gyro (or equivalent) and speed information (VBW or VHW) from water speed sensor
like LOG.
 When speed information is interrupted for 30 seconds from NMEA for any reason or VBW water
status flag is invalid, then the numerical indication of CTW/STW becomes XXX.X in orange color.
 In this case speed can be entered manually.
Manual speed input.
1 Press MENU key to display “Menu”.
Select [MAINTENANCE] => [I / O] => [STW] => [STW] => [MAN], and press ENT key.
2 Select [[MAINTENANCE] => [I / O] => [STW] => [MAN], set manual speed, and press ENT key.
3 Press MENU key to close “Menu”.
4 Move cursor on the upper side of the speed info of the display.
5 Press ENT key to get ready for speed entry. Enter speed by using trackball/joystick.
6 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 information from satellite navigation system. Accordingly course and speed indication at the
upper right side of the display becomes COG/SOG. Speed in water sensor may be affected by current
and stable operation may be spoiled.
 SOG is the absolute speed of the ship with reference to the land.
 If failure of 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 XXX.X in orange color.