Humminbird 300TX manual

Units Depth/Speed. Only available on metric versions, the Units Depth/Speed function allows the user to select the units of measurement for the depth and speed readout. MTR/KPH (meters/kilometers per hour), MTR/KTS (meters/nautical miles per hour), FEET/MPH (feet/statute miles per hour) and FEET/KTS (feet/nautical miles per hour), are available. The 300TX remembers this selection even when the unit is powered off.

Fish ID. There are three selections available: Off, ID+ ON, and Adjust. The factory setting is ID+ ON. With Fish ID Off, sonar returns are displayed as “raw” information. There is no interpretation made by the unit. Selecting ID Off also disables the fish alarm.

ID+ On enables the 300TX to interpret the raw sonar data and, using a variety of techniques, depict appropriate target returns as one of three different size fish symbols. Further identification shows whether the fish is in the wide or narrow beam. The 300TX also displays the depth beneath the surface with the corresponding fish symbols.

Increasing the value to a number greater than zero shows more fish symbols on-screen. In this case smaller sonar returns will be depicted as fish symbols. This is useful for identifying many smaller sonar returns (such as baitfish) as fish symbols.

Decreasing the value to a number less than zero shows fewer fish symbols on-screen. In this case smaller sonar returns are disregarded. This is useful for eliminating many small sonar returns when seeking larger species of fish.

The 300TX remembers this selection even when the unit is powered off.

Numeral Size. Two options are available: Big and Small. The factor setting is Big. With this setting, the digital depth and speed and temp numerals are drawn large enough to be read from across the boat. The big numerals occupy space on the display that could be used for the graphics area. Hence, the small numerals options. With small numerals selected, a greater amount of the display area is available for the graphic view. This effectively increase the display resolution of the unit.

Numeral size settings are remembered when powered off.

Transducer. The Transducer Option controls the 300TX’s ability to determine the transducer or wide side transducer, no adjustment to this menu is needed unless the transducer develops a fault, which is a rare occurrence. The factory setting for the Transducer menu is “Auto”. The Transducer menu selections will be remembered when the 300TX is turned off.

If a faulty transducer is connected, the 300TX may not change the screen presentation to match the transducer. In this instance, you may need to manually select “Tri-beam” for the tri-beam transducer or “Side” for the WideSide transducer.

Often a transducer switch is used to connect two tri-beams transducers, or a tri-beam and a wide side to the 300TX. In “Auto” the 300TX identifies the transducer as the