Furuno CH-270 - Manual (Page 30)

2. HORIZONTAL MODE
2-10
2.7 Choosing the Training Speed
The training speed determines how fast the transducer scans the sounding sector. Two
choices are available, normal speed and high speed, and one may be chosen 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 the full 360° picture.
High (12 °): 30 transmissions required to complete the full 360° picture.
The time required to train a full circle depends on range used and other factors. The table
below shows the time required to complete one full circle on each range.
Range 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Unit ft 40 80 120 200 300 400 500 600 700 800 1000 1200 1500 2000 2500
Norm 11 11 11 11 11 11 13 15 17 20 25 30 37 49 61
Time
required
(sec) for
one full
circle
Fast 11 11 11 11 11 11 12 14 15 16 19 21 25 31 37
Unit m 10 20 40 60 80 100 120 160 200 250 300 400 500 600 800
Norm 11 11 11 11 11 11 11 14 17 21 25 33 41 49 65
Time
required
(sec) for
one full
circle
Fast 11 11 11 11 11 11 11 13 14 16 18 22 26 30 38
Note 1: The above values are for reference purposes. The actual training speed may vary.
Note 2: The range setting must be at least 160 meters to activate high-speed training.
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
Location of cursor position data