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3.10
Applying Proper TVG
The TVG function is the same as the one explained in the sonar mode. For best re-
sults, set both TVG level and time a little lower than the ones in the sonar mode. The
setting is mode on the BOTTOM/3D menu screen and the usual setting for both time
and level is 3.
TVG level rejects surface noise, which may mask shallow targets and TVG time adjust
the effective depth.
Level too low
3.11
Rejecting Interference and Noise
While observing the picture, you may encounter occasional or intermittent noise and
interference as shown below. This is mostly caused by onboard electronic equipment,
engine, propeller noise, or electrical noise from other sonars being operated nearby.
Turn on the interference rejector (IR) in the SONAR menu to reduce or eliminate the
interference.
Interference noise
(angle: 6º)
Proper
R→
↓
Turn on the
[IR] function
3. VERTICAL FAN MODE
Level too high
Time too high
R→
↓
Turn on the [IR] on
the SONAR menu,
this mark apears
3-7
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