Humminbird TS2-3 - Manual (Page 27)

HOW TO READ THE DIAL
Objects Under Water A lake bottom is seldom level or uniform,
and objects in the water or on the bottom may also vary in
depth. The dial readings will indicate these varying conditions
accordingly. To distinguish between the dial indications of rocks
and fish, anchor the boat and watch for signals that change. A
changing signal will usually indicate a moving fish.
Pages 23 through 25 show you examples of underwater
conditions and dial readings. Study these drawings for help in
interpreting what you read on the dial.
NOTE: For additional information and illustrations showing the
interpretation of the depth sounder readings, refer to the
"Humminbird Trouble Shooting and Consumer Information
Guide."
This booklet is available at no charge from Humminbird
Customer Service Department. i-800-633-1468. Alabama
residents should call 1-800-821-8315.