Furuno CSH-23F/24F manual Advanced Level Operation, Finding Fish School Center

ADVANCED LEVEL OPERATION

Finding Fish School Center

When you want to find the center depth of a fish school, use the auto tilt function, which automatically scans the tilt angle within the selected width. There are two automatic scan range, WIDE and NARROW, which can be selected by the INIT SET/TEST menu. Note that the NARROW is under develepment.

Table 7-1 Automatic scan range at menu setting WIDE of

OTHER/INIT SET/TEST menu

Range (m)	Width (1)	Width (2)	Width (3)	Period
60, 100	±10°	±16°	±20°	every 6 transmissions
150, 200	"	"	"	every 4 transmissions
300, 400	"	"	"	every 2 transmissions
500, 600	±8°	"	"	"
800	±6°	±12°	±16°	"
1000	±4°	±8°	±12°	"
more than 1200	±2°	±4°	±6°	"

For example, when the RANGE control, TILT lever and WIDTH key are set to 800 m, 8° and width (1), respectively, the tilt angle varies at every transmission as follows:

8°→8°→10°→10°→12°→12°→14°→14°→12°→12°→10°→10°→ 8° →8°→ 6°→6°→4°→4°→2°→2°→4°→4°→6°→6°→8°→ 8°

Figure 7-1 Tilt angle setting

Table 7-2 Automatic scan range at menu setting NARROW of

OTHER/INIT SET/TEST menu

Range (m)	Width (1)	Width (2)	Width (3)	Note: Period equals
60, 100	±4°*	±6°*	±8°*	one transmission.
150, 200	±2°	±4°*	±6°*	Tilt angle changes
300, 400	±1°	±2°	±4°*	in 2° steps for aster-
500, 600	"	"	±3°	isk-marked
800	"	"	"
				width; 1° steps for
1000	"	"	"
				all other widths.
more than 1200	"	"	"

7-1