Garmin TM258 Fishfinder Transducer TM258-6G

The TM258 is a 1kW transom-mount fishfinder transducer with a fast-response temperature sensor that is designed to enhance the performance of any 600W sounder or fishfinder. Its four elements focus elliptical beams at both frequencies for crisp targets and clear bottom definition, with many times the sensitivity of a P66. The TM258’s included stainless-steel, high-performance mounting bracket is easy to install and the unit has a streamlined shape that delivers high-speed performance

This '-6G' version of the transducer is for Garmin sounders and fishfinders that use the standard Garmin 6-pin transducer connector.

The TM258 is shipped as a generic 'Mix and Match' transducer plus a brand-specific adapter cable. If you change fishfinder brands in the future, you can continue to use the transducer with a new adapter cable.

Product Features

• RMS power 1000W, adapts to 600W
• Frequency 50/200kHz
• Beam width 15x21 deg at 50kHz, 3x5 deg at 200kHz
• Depth readings up to 1500-2200 ft at 50kHz, 700-1000 ft at 200kHz
• Kick-up transom bracket included, accommodates transom angles between 3 and 21 degrees