GP1670F_1870F Operator's Manual - Furuno USA

7. FISH FINDER OPERATIONSClutter7.7 Picture Advance SpeedThe picture advance speed controls how quickly the vertical scan lines move acrossthe screen. A fast advance speed expands the size of a school of fish horizontally onthe screen. A slow advance speed shortens the school of fish. Use a fast advancespeed to see the hard bottom. Use a slow advance speed to see the smooth bottom.FastSlow1. Open the [FISH FINDER] menu and select [PICTURE ADVANCE].2. Select a picture advance speed. The options in the window indicate thenumber of scan lines made per transmission. For example, [1/2]creates one scan line per two transmissions. [1/16] is the slowest advancespeed and [2/1] is the fastest speed. [STOP] stops picture advance,and is useful for taking a screenshot or photo.CAUTIONThe picture is not refreshed when the pictureadvancement is stopped.Maneuvering the vessel in this condition cancause grounding.7-11