Furuno TS-331A - Manual (Page 33)

2. SONAR OPERATION
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Once a sonar data file has been opened, the operation of real-time sonar data
acquisition will terminate. Although only one sonar data file may be opened at a
time, another data file may be opened, closing the current file.
You can once again change the operation to real time data interrogation by
selecting “menu->File->Connect to Sonar Head” or clicking the Toolbar button
. When the system begins acquiring data from the sonar head, the current
data file will be closed.
The TS-331A program provides several convenient methods (menu commands,
dialog boxes, and toolbar commands) to control the sonar unit’s operations,
operating parameters and data display windows.