The georeferenced sonar/echosounder image displayed in the BioBase trip viewer is based on the log file you selected. The image displayed is matched with the trip path and the precise area on the sonar/echosounder log where the data were derived.
When you select an area on the displayed sonar/echosounder image, it is presented with a vertical line (A). This line is positioned according to the location of the orange dot displayed on the track (B).
You can change the views between different sonar/echosounder images available in the Sonar tab. The available image views are depending on the selected trip.
By default, the primary or the traditional sonar/echosounder image available on the selected trip is displayed in the Sonar tab.
The DownScan image will be viewable if the selected log file has a DownScan data associated to it.
The image shown below is an example of a DownScan image associated to a selected trip. Notice the high detail of plant images and fish targets at the edge of the vegetation bed.