Humminbird 900 Series, 997c Combo manual What’s on the Side Imaging Display, Triplog

What’s on the Side Imaging Display

Side Imaging displays a number of easily recognizable features that allow for accurate interpretation of bottom contour and structure. For Side Imaging, the bottom composition determines the intensity of the sonar return. For example, rock and gravel provide a clearer sonar return than mud and sand because of their relative density. Upward slopes that face the transducer reflect sonar better than downward slopes that face away from the transducer. You can find a number of easily recognizable features on the Side Imaging display that allow for accurate interpretation of bottom contour and structure, including the following items:

Triplog

Triplog

1		8	The water column shows the relative depth of the
			water under the boat at a given time. Variations in
			the width of the water column show variations in the
			distance to the bottom as the boat passes over.
2	8	9	Shadows result from a lack of reflected sonar from a
3	4		particular area, and can be more valuable for
			interpretation than the sonar reflected by the object
			itself. Use shadows to help you see the image in 3
			dimensions, oriented in space. You can gain insight
	10		into the actual shape of an object, or the depth to
			which it has sunk into the bottom, through shadows
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	5		on the display.
		10 Topography Changes
		11 Bottom Return

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1	Depth - water depth; can be set to alarm when the water becomes too shallow.	5	Barometric Pressure - Requires optional-purchase WeatherSense®
2	Timer - Elapsed time with Speed accessory or GPS Receiver.	6	Temperature - water surface temperature
3	Distance - Distance traveled with Speed accessory or GPS Receiver.	7	Speed - if a Speed accessory or GPS Receiver is attached, the 900 Series™ can display
4	Average Speed - Average speed reading with Speed accessory or GPS Receiver.		the speed of the boat, and can keep a triplog of nautical or statute miles traveled.

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