Day 4

Day 4

Today was another full day of classroom sessions. We learned more about the vehicles' settings and filtering of data, including the need to calculate for tides and sound velocity. Sound velocity can change temporally and spatially if you go past an outflow, estuary, river, eddy, rip tide. There must also be calculations for heave (and do it often) because if the vehicle is moving up and down, the position of the sound is off and sonar does not make an accurate image.

We then ran some tests on the Gavia in the CCOM testing tanks

Here, Tom instructs the group on some aspects of the GeoSwath program...
...and this is an image of the test tank as seen by the Geoswath sonar.

The Gavia seen through a port hole in the tank