Make sure that the sonar sensor is in direct contact with the water and that you are
operating the unit in depths between 2.5 and 300 Ft (.8 to 90 m). Be aware that the depth
signal is sent from the sonar sensor in a manner similar to that of a flashlight beam. Holding
the unit perpendicular to the water surface will ensure accurate readings. The unit will not
function properly if there is air between the sonar sensor and the water surface; keep this
in mind when using the device through a boat hull or ice.
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