Raymarine C140w, C90w manual Menu Item Description Options Ping Rate Limit per, Second, Ping Enable

Menu Item	Description	Options
Ping Rate Limit (per	Provides a speed limiter;	5 to 30 pings per second
second)	it is useful to adjust	(30 default)
	the ping rate to suit
	local conditions. For
	example, the ping rate
	may be too fast when
	there is a hard bottom
	in shallow water. This
	setting reverts to 26
	pings per second when
	the DSM unit is powered
	off.
Ping Enable	The sonar ping is	Disabled, Enabled
	normally enabled. It
	can be disabled. This
	is useful when other
	equipment is being
	tested, or if someone is
	diving beneath the boat.
	This setting reverts to
	Enabled when the DSM
	unit is powered off.

Fishfinder Transducer Calibration

Your fishfinder transducer must be calibrated correctly to achieve accurate depth readings.

The multifunction display receives the image from a DSM which processes sonar signals from a transducer mounted in the water. If the transducer is equipped with a speed paddle wheel and temperature-sensing thermistor, the DSM calculates speed and temperature. To ensure accurate readings, it may be necessary to

calibrate the transducer(s) by applying offsets to depth, speed and temperature. As these settings are held in the DSM and relate to the transducer, they are applied system-wide.

Fishfinder transducer settings

Menu Item	Description	Options
Select Transducer	Select the appropriate	•	B256/M256
	transducer type from	•	B260/M260/SS560
	those displayed.
		•	R99/R199
		•	B258
		•	SS270/B264
		•	, B164
		•	R209/R299
Select Speed	Select the appropriate	•	NONE
Transducer	speed transducer from	•	UNKNOWN
	those available. This
	option is only available	•	B120/P120 ST600
	if you are not using a	•	ST69
	combined Depth/Speed
	or Depth/Speed/Tem-	•	B120/P120 ST800
	perature transducer.
		•	CS4500
Frequency Calibration	Fine tune the frequency	•	200 kHz. Tune from
	of the transducer.		180 to 220 kHz
		• 50 kHz. Tune from 45
			to 55 kHz

Using the fishfinder 169