Sounding Modes
The sensor can send pings according to three different sounding modes.
Down 1
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Sensor sends pings towards down direction (1) only. You can control the distance with the seabed. Pings are sent quicker than with the other modes, so more data is received, which enables a better horizontal resolution. This mode is recommended for better quality echogram images. |
Down 1 + Up
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Sensor sends pings towards down (1) and side (2) directions. With the down sounding, you can control the distance with the seabed. If applicable, with the side-looking (2) sounding (called up sounding in Mosa2), you can see schools of fish inside the net when the purse seine is deployed and going down. Fewer pings are sent because they are distributed between the 2 directions. As a result, data arrives slower to the receiver and echograms are of lesser quality. |
Down 1 + Down 2
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Sensor sends 2 consecutive pings towards down direction (1 and 2). This mode is useful if you need to send two different pings towards the down direction. For example, sending one short and one long ping, or sending one low frequency and one higher frequency ping. Like down + up mode, fewer pings are sent because they are distributed between the two different down soundings. As a result, data arrives slower to the receiver and echograms are of lesser quality. |