Furuno CH-250 manual Selecting the Training Speed, Finding Echo Position with the Cursor

2.7Selecting 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
Unit		m	10	20	40	60	80	120	160	200	250	300	400	500	600	800	1000
		ft	40	80	120	200	300	400	500	600	700	800	1000	1500	2000	2500	3500
Time		Norm	7	7	7	7	7	10	13	16	20	24	32	40	48	64	81
required
(sec)	for
one	full	Fast	7	7	7	7	7	9	11	13	15	17	21	25	28	36	45
circle

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.

2.8Finding 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.

Cursor position data

: Horizontal range

: Depth

B: Bearing

NAV

DATA

Cursor

Figure 2-10 Location of cursor position data

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