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5-11
HEADING INDICATION: Selects heading indication format, true (default setting) or azimuth, for
the echo sounder and vertical fan modes. The default setting is TRUE. Requires heading data.
NORTH MARK: Turns the north marker on or off (default setting). Requires heading data. When
turned on, the bearing scale shows bearings in cardinal points (N, S, E, W) and half-cardinal
points (NE, NW, SE, SW).
CSE DATA: Selects heading data source, navigator or gyrocompass, to draw ship’s track. The
default setting is navigator. For heading sensor or gyrocompass connection, choose
gyrocompass.
NAV DATA: Selects source of position data, GPS, Loran C, Loran A, DR (Dead Reckoning),
Decca or Others (for equipment not shown, receives talker only). Default setting is GPS.
TVG CORRECTION: Changes TVG curve to compensate for attenuation absorption of
ultrasonic wave in water. OFF (default setting), 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: Selects unit of depth measurement: meters (default setting), feet, fathoms, passi/braza,
Hiro.
TEMP: Selects unit of water temperature measurement: °C (default setting), °F.
TARGET L/L: Turn on to output event marker position to external equipment. Requires heading
and latitude and longitude data from external equipment. Default setting is OFF.
CUSTOM KEY: Selects function of custom mode keys: preset (default setting) or short-cut. For
details see paragraph 5.2 on page 5.3.
EMPHASIS MODE: Turn on to stretch strongest strength echo in range direction. Default setting
is OFF.
ETA MARK: A vector line extends from the own ship marker in direction of ship’s bow on the
horizontal mode display. The tip of the line shows the estimated time of arrival after the selected
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
Figure 5-10 ETA marker