How does SONAR work?

SONAR(SOund NAvigation RAnging)
Sound moves thru water at about 4920 feet/second (almost a mile).

Your fish finder measures the amount of time it takes for the sound pulse it sends out to travel to the bottom and back. In simple terms your fish finder acts first like a speaker (sending the sound out) and then switches over to a microphone (picking the sound up).

Now anything that gets in the path, sends back an echo which can be interpreted by your fish finders electronics as bottom, fish, rocks, logs.

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Humminbird Fish Finder Manuals
	Fishing Buddy (110, 120, 130,140C)		Ice Flasher Series (Ice 35, 45 and 55)		Inside Hull Mounted Transducer
Matrix Series Operation Manuals
	Matrix 10, 12, 17, 20, 27, 37 Manuals		Matrix 15		Matrix 25
	Matrix 35		Matrix 47		Matrix 55 and 65
	Matrix 67 GPS TrackPlotter		Matrix 77C		Matrix 87C Manual
	Matrix 97 GPS Track Plotter
100 Series Operation Manuals
	100SX Single Beam FishFinder		200DX Dual Beam
	141C Operations Manual		161 GPS Chartplotter
300 Series Operation Manuals
	Humminbird 323 Manual		343C		363 GPS Chartplotter
	383C GPS Chartplotter
500 Series Operation Manuals
	500 Series (515,525,535,565,575)		580 Fish Finder Chartplotter		595C FishFinder
700 Series Operation Manuals
	717 and 727		737 GPS Chartplotter		747 and 777C2
	757C, 787C2 and 787C2I GPS		767 GPS Chartplotter		797C2 GPS Chartplotter
800 Series Operation Manuals
	858C,898C SI
900 Series Operation Manuals
	917C and 957C		931C,931c DF,937C,937C DF		947C
	958C and 998C SI		997C SI Combo
1100 Series Operation Manuals
	1155c Chartplotter		1157C and 1197C Combo

Lowrance Fish Finder Manuals
It doesn’t matter if you are a novice or a pro angler, you will find that your Lowrance Fish Finder/GPS is easy to use and capable of handling all your navigation and sonar needs. The manuals are designed so that you can find the information you need quickly and easily, so that you spend more time boating and fishing than reading. In fact all Lowrance sonars have an auto mode that finds and displays the bottom, fish, structures and more right out of the box.
LCX 10-100 Series
	LCX18C and LCX19C		LCX104C		LCX 110C and LCX 111C HD
	LCX 112C and LCX 113C HD
LCX 20 Series
	LCX 25C and 26C HD		LCX 27C and LCX 28C HD
LCX 30 Series
	LCX 27C and LCX 38C HD
LMS 300 Series
	LMS 320 and LMS 320DF
X Series
	X51 and X58DF		X65		X67C
	X125, X126DF, X135, X136DF

Eagle Fish Finder Manuals
Your unit is a high-quality sonar designed for both professional and novice fishermen. All Eagle sonars have an automatic mode that finds and displays the bottom, fish, underwater structure and more – right out of the box. All you have to do is press the on (PWR) key.
	Cuda 128, 168 and 168EX		Cuda 242, Cuda 242 Portable		Cuda 300
	FishMark 320 and Seafinder 320DE

Miscellaneous Manuals
	Fishing Knots		Filtering Electrical Interference