Humminbird manual Using the 405SX, HOW Sonar Works, Simulator Operation

USING THE 405SX

HOW SONAR WORKS

HOW SONAR WORKS

Your Humminbird unit uses sonar to locate and define underwater objects, define the bottom terrain, as well as determine distance.

Sonar technology is based on sound waves. Your Humminbird unit sends out a sound wave signal. With this signal it

determines distance by measuring the time between the transmission of the

sound wave and when the sound wave is reflected off an object. Your Humminbird uses the reflected signal to

interpret location, size and composition of an object.

Sonar is very fast. A sound wave can travel from the surface to a depth of 600' and back again in less than ¹⁄₄ of a second. It is unlikely that your boat can "outrun" this sonar signal.

The 405SX is a 200 kHz, single-beam fishfinder. The 200 kHz frequency provides excellent sonar resolution (the ability to distinguish small returns or returns which are close to the bottom), while providing depth capabilities to 600’. The shape of the sonar beam is symmetrical and covers an area of approximately 24 degrees side to side and front to rear.

Actual depth capability depends on factors such as bottom hardness, water conditions, and transducer installation. Units will typically read to deeper depths in fresh water than in salt water.

SIMULATOR OPERATION

The 405SX contains a simulator that allows you to use the unit as if you are on the water. The simulator is invaluable for learning how to operate the 405SX.

There are two ways to start the simulator. If the unit is powered off, press and hold the POWER button for approximately three seconds until you hear a continuous chirp.

The simulator can also be started by selecting the Simulator option on the start- up screen after you power-up the unit. When this screen is shown, simply press

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