Upgrade your boat's sonar capabilities with the Furuno TM185M, a powerhouse medium-frequency CHIRP transducer designed for serious anglers and navigators who demand crystal-clear underwater visuals. This transom-mount unit delivers exceptional target separation and depth penetration, helping you spot fish, structure, and wrecks with unmatched precision even in challenging conditions.

Why Medium-Frequency CHIRP Makes a Difference

Unlike traditional fixed-frequency sonar, CHIRP technology sweeps continuously across a broad band—from 85 kHz to 135 kHz—producing incredibly detailed images. At lower frequencies around 85 kHz, the wider 16-degree beamwidth offers broad coverage ideal for scouting large areas in shallower waters. Switch to the higher 135 kHz end for a focused 11-degree beam, perfect for pinpointing targets in deeper zones up to 1,500 feet. Paired with a 1,000-watt power rating, this transducer punches through thermoclines and sediment, revealing bait schools and bottom contours that single-frequency units often miss.

Built Tough for Real-World Boating

Crafted with a durable urethane housing and a robust stainless steel bracket, the TM185M withstands the harsh marine environment, from saltwater spray to hull-pounding waves. The transom-mount design keeps installation straightforward, positioning the transducer in the prop wash for optimal performance without drilling into your hull. Integrated temperature sensing adds another layer of utility, letting you monitor water temps to track seasonal migrations or prime fishing spots.

• Beamwidth: 16° to 11° for versatile coverage
• Cable Length: Generous 39.3 feet for flexible routing
• Connector: Reliable 10-pin setup for seamless integration
• Functions: Depth and temperature sensing

Key Performance Advantages

Anglers swear by the TM185M for its ability to separate closely packed fish or distinguish bait from game species, reducing guesswork on busy reefs or drop-offs. The medium CHIRP range strikes a sweet balance: deeper penetration than high-frequency models without sacrificing resolution like low-frequency options. In practical terms, this means fewer false readings from bait balls and clearer wrecks for trophy hunting. Boaters appreciate the temperature data for safety, like spotting current shifts or upwelling zones.

Effortless Transom Installation Tips

Mounting is user-friendly—secure the stainless bracket to your transom, angle it 12-20 degrees down for proper water flow, and route the long cable neatly. Position it outside the deadrise and prop turbulence for bubble-free readings. Pro tip: Deadhead (dry-run) the system on water before full deployment to calibrate and avoid air entrainment issues common in rough transoms.

Long-Term Reliability and Care

Furuno's engineering shines in longevity, backed by thoughtful design that resists fouling and corrosion. Rinse with fresh water after every saltwater trip, inspect the face for marine growth, and store in a cool, dry spot offseason. This proactive care ensures peak performance season after season.