Humminbird 900 Series, 997c Combo manual Submerged Ravine with Timber

Boat navigation: It is important to understand that when the boat turns, successive beam strips to one side will begin to overlap and the strips on the other side will fan out, providing some distortion to the image. Because of this, the best imaging performance is produced by straight line navigation and minimal side-to-side boat motion (i.e. wave induced, etc.) This applies to navigation by either the main engine or the trolling motor. Minimize turning time and avoid wave action that induces large side-to-side rocking of the boat. For example, if there is a lot of wave activity, try to move the boat so that it is perpendicular to the waves instead of parallel with the waves in order to minimize the side-to-side rocking of the boat.

Beam Coverage: When there is an area directly under the boat that does not have SI beam coverage, this area will be covered by the standard 200/83 kHz down-looking beam and displayed in the Sonar views. The net effect of this, on the display, is that a single object may appear as two separate entities when in reality, it is one continuous object. See Submerged Bridge: A Closer Perspective and the Submerged Bridge graphics on the next page for examples of this.

Submerged Bridge, Creek Channel and New Bridge Piling

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1 New bridge pilings Submerged bridge 3

2Creek channel

Submerged Ravine with Timber

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1	Possible drop off	Submerged tree	3
2	Submerged timber	Submerged ravine	4

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