48
failure
corrective action
The sonar image is fuzzy
between the water surface
and bottom
The boat does not go right,
it always go “S” shape route,
especially when the wave is
big
1) The transducer should be far away from any air
bubbles, such as the engine and propeller. We
suggest installing the transducer at 1/3 position form
the head of the boat.
2) Bubble is the primary source of interference for all
sonar equipments. So, the mounted transducer
should be some depth under water. The deeper the
better. 15cm is recommanded.
3) If the depth is less than 15cm, waves of water
surface can affect sonar image quality. Adjust the
sensitivity to 4-6 may help.
1) The mounted GPS receiver (with compass built
in) should be far away from such substance:
magnets, iron, nickel, etc. 30cm distance is
recommended.
2) When wave is big, boat can not run smoothly on
the water, the device always correct the route once
the boat is far off track, which my cause the boat
going “S” shape route.
Please try decreasing the Steering Sens.
1) For all sonar devices, there are two blind regions,
even for the high frequency sonar like the TF740, the
blind regions still exist:
- One blind region: 0.5 m below from water sufreace.
- Another blind retion: 0.3m above bottom.
If fish is in the blind region, it is hard to detect.
So, to get an perfect sonar performance, we suggest
using the device in water not shallower than 1.2m.
2)
[Fish ID. Sens.]
menu control the threshold of fish
size display. If needed, please set the
[Fish ID. Sens.]
parameter to 3
There is no fish detected on
display, even I can see fish in
the water.
