Chapter 4: Fishfinder Setup 45
Interference Rejection (Int Rej)
Two or more sonar-equipped vessels operating within range of each other can
interfere with sounder operation. This usually appears as vertical streaks on the
display that do not represent actual targets.
This option can reduce such interference, either manually or automatically.
• AUTOMATIC selects the best rejection level for you
• LOW minimizes rejection of potential interference. Use this setting when you
want to be sure that what has been removed are really false returns.
• MEDIUM rejects a moderate amount of interference without weakening the
appearance of actual targets.
• HIGH rejects much more interference but can potentially weaken the appear-
ance of actual targets.
The default setting is AUTOMATIC.
Second Echo Rejection
A so-called “second echo” can caused by the sonar signal returning from the
bottom, reflecting off the water’s surface, bouncing off the bottom again and
returning once more. This option helps eliminate identifying a false bottom.
Select from the following:
• OFF, which offers no rejection
• LOW, which provides minimal rejection by slightly reducing the ping rate
• HIGH, which offers the greatest signal rejection by decreasing the rate further
The default setting is LOW. Only set this setting to HIGH if you notice second
echoes appear on your display.
Max. Ping Rate
The setting determines the maximum number of sonar pulses, or pings, the
transducer emits per second. You can set Max Ping Rate anywhere between 5–
30, in increments of 1. You can reduce this number down to a minimum of 5 pings
per second, if necessary, to help reduce second echoes.
The default setting is 26 pings per second. This setting is reset at power-up.
Ping Enable
Under most circumstances, the sonar ping is enabled. It can be disabled when
other equipment is being tested or if someone is diving beneath the boat.
The default setting is ON. This setting is reset at power-up.
81254.book Page 45 Monday, March 6, 2006 2:29 PM
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