Furuno CH-270 - Manual (Page 63)

3. VERTICAL SCAN MODE
3-9
3.7 Choosing the Tilt Speed
The [FAST SCAN] key chooses the tilt speed; that is, the stepping angle at which the
transducer scans. Two choices are available, 3
°
(normal speed) and 6
°
(high speed). Each
time the key is pressed the display momentarily shows “NORM” (normal speed) or “FAST”
(high speed).
Normal: 60 transmissions to complete a half circle, in increments of 3
°
.
High: 30 transmissions to complete a half circle, in increments of 6
°
.
The time required to scan one full area of 180
°
depends on range used and other factors.
The table below shows the time required to complete one full area on each range.
Ranges 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Unit ft 30 60 90 120 150 200 250 300 400 500 600 800 1000 1500 2000
Norm 13 13 13 13 13 13 13 13 15 17 20 26 31 46 60
Time
required
(sec) for
one full
180
°
area
Fast 9 9 9 9 9 9 9 9 9 10 11 14 17 24 31
Unit m 10 20 30 40 60 80 100 120 160 200 250 300 400 500 600
Norm 13 13 13 13 13 13 13 14 18 22 27 31 41 50 59
Time
required
(sec) for
one full
180
°
area
Fast 9 9 9 9 9 9 9 9 10 12 15 17 22 27 31
Note: Values shown are for reference purposes. Actual values may vary.
3.8 Finding Echo Position with the Cursor
The cursor measures horizontal range and depth. Operate the Omnipad to place the
cursor where desired. Cursor data appears at the top left-hand corner on the screen.
NAV
DATA
Cursor
Cursor data
+→
: Horizontal range
↓
: Depth
Location of cursor position data