If... | Then... |
|
|
Video Sounder |
|
no picture but marks and | check if picture advance speed is set to "0" on the VIDEO |
characters appear | SOUNDER SETUP menu. |
|
|
| check for loosened transducer connector. |
|
|
picture appears but no zero line | If using manual video sounder operation, range is shifted; |
| set shifting to zero to correct. |
|
|
picture sensitivity is too low | check gain setting, if using manual operation. |
|
|
| marine life or air bubbles may be clinging to transducer face. |
|
|
| water may be dirty. |
|
|
| bottom may be too soft to return a suitable echo. |
|
|
depth is not displayed | adjust gain to display bottom echo in dark tone. |
|
|
noise or interference obsructs | check if transducer cable is near ship's engine. If it is, |
the display | relocate it. |
|
|
| check ground. |
|
|
| other video sounders may be operating nearby and on same |
| frequency. |
|
|
water temperature graph appears | check for loosened sensor cable. |
but no or wrong readout |
|
|
|
6 – 7
