Furuno CSH-5L/CSH-8L manual Advanced Sonar Operation, Echosounder Mode, Marks And Data

3. ADVANCED SONAR OPERATION			3-1
3.1	Tracking a Fish School (target lock)		3-1
3.2	Detecting Fish Schools Aurally		3-3
3.3	The Fish Alarm		3-4
3.4	Measuring Fish School Speed		3-5
	3.4.1	Entering a fish mark	3-5
	3.4.2	Deleting individual fish marks	3-6
3.5	Relocating Fish School for Easy Observation		3-6
3.6	Event Mark, Own Ship Position Mark		3-7
	3.6.1	Event mark	3-7
	3.6.2	Entering an own ship position mark	3-8
	3.6.3	Deleting an event mark	3-8
3.7	Collectively Deleting Marks		3-9
3.8	Function Keys (F1-F4)		3-10
	3.8.1	Operating the function keys	3-10
	3.8.2	Programming for fishing ground or target fish	3-10
	3.8.3	Programming specific function	3-11
	3.8.4	Confirming function key program	3-12
3.9	Suppressing Effects of Pitching and Rolling (Stabilizer)		3-13

4. ECHOSOUNDER MODE		4-1
4.1	Choosing the Range	4-1
4.2	Adjusting the Gain	4-2
4.3	Picture Advance Speed	4-3
4.4	Measuring Depth	4-3
4.5	Suppressing Interference	4-4
4.6	Suppressing Low Level Noise	4-4
4.7	Erasing Weak Echoes	4-5
4.8	Other Items on the Sounder Menu	4-6

5.	MARKS AND DATA		5-1
	5.1	Marks and Data on the Normal Display	5-1
	5.2	Marks and Data on the Echosounder and Audio Displays	5-5
6.	INTERPRETING THE DISPLAY		6-1
	6.1	Bottom Echo	6-1
	6.2	Fish School	6-2
	6.3	Sea Surface Reflections	6-3
	6.4	Wake	6-3
	6.5	False Echo by Sidelobe	6-4
	6.6	Noise and Interference	6-4
7.	MARKS AND SYSTEM MENUS		7-1
	7.1	MARKS Menu	7-1
	7.2	SYSTEM Menu	7-3

iv