Furuno CH-500, Operator'S Manual

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2. HORIZONTAL MODE
2-12
Note 1: When only one of the combination display is set as “On”, combination se-
lection window does not appear. The selected combination will directly appear.
Note 2: When all of the selection are set as “Off” in the “System Setting 3” menu,
“HOR./VERT” will directly appear.
2.10 How to Interpret the Horizontal Display
The wide sounding beam is emitted from the soundome at a certain tilt angle (see
hatched area in the figure below).
At the default setting, the information (target echoes) obtained by this beam is dis-
played in sectors at 6° increments on the screen. Thus, all directions around the boat
are sounded in 60 transmissions.
The train speed can be adjusted to suit your needs (see section 2.11).
How the Horizontal mode picture is displayed on the screen
The appearance of echoes on the screen varies, depending on factors such as trans-
mission frequency, gain and TVG settings, seabed composition and contours.
Tilt angle (θ) Tilt angle (θ) Tilt angle (θ)
Soundome
Tra
in
Sounding beam Sounding beam
Normal train speed takes a “picture” at 6° intervals.
Each “dot” on the outer ring of
the horizontal display indicates
6°. In this example, the scans
are done at 12° intervals.