2d cone shaped sonar beam vs DI fan shaped sonar beam...
Each time the unit pings.. It processes the echo data in the sonar beam shape and plots that info onto the unit screen to the far right of the screen (a few pixels wide) pushing the "previous" pings data info to the left on the screen (history)...
If the fan shaped DI sonar beam is not moving... The unit is "pinging" the exact same small "slice" of water plotting "copies" of the same echo data onto the screen again and again...
The fan shaped DI sonar beam has to ping a "new" slice of water each time so that when the processor "stacks" these slices together on the screen... The slices will build an image that we see as a DI image...
Rickie


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