Onwa KF-667 manual Zoom mode high or low frequency, Marker Zoom

ZOOM mode (high or low frequency)

Three types of zoom displays are available: marker zoom, bottom-lock expansion,

bottom zoom. The zoom mode to be used can be selected on the main menu with ZOOM MODE.

Normal	This mode expands selected area of the normal picture to
	full vertical size of the screen on the left-half window. You
display
	may specify the portion to expand with the VRM (Variable
Variable range
	Range Marker), which you can shift with [ ]or [ ]. The
marker(green)
	area between the VRM and the zoom range marker is
This section	expanded. The length of the segment is equal to one
is zoomed	division of the depth scale.

Marker-zoom Zoom marke

display (yellow)

MARKER ZOOM
	Zoom marker (yellow)		This display provides a compressed normal picture on the
			top 2/3 of the screen and a 5 or 10 meter (10 or 20 feet)
			wide layer in contact with the bottom is expanded onto the
			bottom 1/3 of the screen. This mode is useful for bottom
Normal			discrimination. Note that the seabed should be steadily
display			and distinctly plotted in red or reddish-brown. Adjust the
			gain if necessary.
			Note1:The bottom-lock range can be selected on the
Bottom-			system menu.
lock			Note2:The zoom marker can be turned on/off on the
display			system menu.
	BOTTOM-LOCK
			This mode expands bottom and bottom fish echoes two to
			five times to vertical size of the screen, and it is useful for
			determining bottom hardness. A bottom displayed with a
			short echo tail usually means it is a soft, sandy bottom. A
			long echo tail means a hard bottom.
		Zoom	The zone automatically moves so that the bottom echoes
		marker	locate on the lower half of the screen.
		(yellow)	Note1:The amount of expansion can be selected on the
			system menu.
			Note2:The zoom marker can be turned on/off on the
Bottom-	zoom		system menu.
	Normal
display
	display

BOTTOM ZOOM

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