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5. MENU OPERATION
5-10
HEADING INDICATION: Chooses heading indication format, true (figures) or azimuth
(compass points, for example, N, S, etc.), for the echo sounder and vertical scan modes.
Requires heading data.
NORTH MARK: Turns the north marker on or off. Requires heading data.
CSE DATA: Chooses heading data source, navigator or gyrocompass, with which to
draw ship’s track. For heading sensor or gyrocompass, choose “GYRO”.
NAV DATA: Chooses source of position data, GPS, Loran C, Loran A, DR (Dead
Reckoning), Decca or Others (for equipment not shown, receives talker only).
TVG CORRECTION: Changes TVG curve to compensate for attenuation absorption of
ultrasonic wave in water. OFF, standard TVG curve; 1/2, 1/2 of the theoretical absorption
value added to TVG curve, and 1/1, full theoretical absorption value added to TVG curve.
UNIT: Chooses unit of depth measurement: meters, feet, fathoms, passi/braza or Hiro.
TEMP: Chooses unit of water temperature measurement: °C or °F.
TARGET L/L: Turn on to output event marker position to a video plotter. Requires
heading and latitude and longitude data from external equipment.
CUSTOM KEY: Chooses function of custom mode keys: preset or short-cut. For further
details, see paragraph 5.3.
EMPHASIS MODE: Chooses method of picture interpolation processing.
OFF: Interpolation close to raw signal.
NORMAL: Clarifies picture.
RED: Emphasizes strong signals.
ETA MARK: A vector line extends from the own ship marker on the horizontal mode
display, in the direction of ship’s bow. The tip of the line shows the estimated time of
arrival after the chosen ETA time elapses, using the current ship’s speed. ETA is
calculated every second considering tilt and detection range. This function requires
speed input.
ETA marker
ETA marker