Furuno CH-250 - Manual (Page 27)

2-9
2.7 Selecting the Training Speed
The training speed selects how fast the transducer scans the sounding sector. Two choices are
available, normal speed (default setting) and high speed, and one may be selected with the
[FAST SCAN] key. Each time the key is pressed “NORM” (normal speed) or “FAST” (high
speed) momentarily appears at the screen top.
Normal (6
°
) : 60 transmissions required to complete full 360
°
picture (default setting).
High (12
°
) : 30 transmissions required to complete the full 360
°
picture.
The time necessary to train a full circle depends on range and transducer used. The table below
shows the time required to complete one full circle in the horizontal mode using the 150 kHz
transducer.
Ranges 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
m 10 20 40 60 80 120 160 200 250 300 400 500 600 800 1000
Unit
ft 40 80 120 200 300 400 500 600 700 800 1000 1500 2000 2500 3500
Norm 7 7 7 7 7 10 13 16 20 24 32 40 48 64 81
Time
required
(sec) for
one full
circle
Fast 7 7 7 7 7 9 11 13 15 17 21 25 28 36 45
Note1: Above data for soundome having serial no. 1000 and higher.
Note2: The range setting must be at least 160 m to active high speed training, using the 150
kHz transducer. The [FAST SCAN] key is inoperative when the range setting is less
than 160 meters.
2.8 Finding Echo Position with the Cursor
The cursor measures horizontal range, depth and bearing. Operate the Omnipad to place the
cursor where desired. Cursor position data appears at the top left-hand corner on the screen.
: Horizontal range
: Depth
B: Bearing
Cursor position data
Cursor
NAV
DATA
Figure 2-10 Location of cursor position data