Standard Horizon Ff520 owner manual Transducer Setup, Keel Offset

The following are examples of Color Settings:

Figure 4.6a - Color Settings item

Figure 4.6b - Examples of Color Settings: white on the left and blue on the right

4.7TRANSDUCER SETUP

This menu allows you to calibrate the speed through the water, water temperature and the keel/prop offset of the transducer.

	Figure 4.7 - Transducer Setup sub-menu
Keel Offset	: The keel offset can be set as to cause the Fish Finder to report either the
	depth below the keel or the actual water depth from the surface. If we want the Fish Finder
	to report the depth below the keel, we have to enter a negative value meaning the
	transducer is mounted above the keel. So if, the range scale is set to e.g. 20 feet, the
	actual depth below the transducer is 15 feet and a KEEL OFFSET of -3 feet is entered,
	then the digital depth shall report 12 feet because that is the depth below the keel
	and the scale on the graphic image shall change so that the range shown is
	not 0 to 20 feet but -3 to 17 feet. If we want the Fish Finder to report the actual water depth
	from the surface, we have to enter a positive value meaning the transducer is mounted
	below the surface. Assume that the transducer is mounted say 5 feet below the
	water line and we want the unit to report the water depth from the surface,

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