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home > Humminbird XNT-9-HW-MSI-150-T MEGA SI/DI Dual Spectrum CHIRP Transducer w/Temp f/HELIX® 7/8 MEGA SI > Humminbird XNT-9-HW-MSI-150-T MEGA SI/DI Dual Spectrum CHIRP Transducer w/Temp f/HELIX® 7/8 MEGA SI
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Humminbird XNT-9-HW-MSI-150-T MEGA SI/DI Dual Spectrum CHIRP Transducer w/Temp f/HELIX® 7/8 MEGA SIUpgrade your fishing setup with the Humminbird XNT 9 HW MSI 150 T transducer, a powerhouse for serious anglers chasing crystal clear underwater views. This transom mount marvel combines MEGA Side Imaging, Down Imaging, and Dual Spectrum CHIRP sonar to deliver unmatched detail on fish holding structures, bait schools, and bottom contours. Whether you're navigating shallow bays or deep lakes, its advanced frequencies cut through the water like a knife,
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Upgrade your fishing setup with the Humminbird XNT-9-HW-MSI-150-T transducer, a powerhouse for serious anglers chasing crystal-clear underwater views. This transom-mount marvel combines MEGA Side Imaging, Down Imaging, and Dual Spectrum CHIRP sonar to deliver unmatched detail on fish-holding structures, bait schools, and bottom contours. Whether you're navigating shallow bays or deep lakes, its advanced frequencies cut through the water like a knife, helping you pinpoint trophy fish with ease.

Why Anglers Choose the XNT-9-HW-MSI-150-T for HELIX 7 and 8 Series

Designed specifically for Humminbird HELIX 7 CHIRP MEGA SI GPS G3, G3N, and HELIX 8 CHIRP MEGA SI GPS G3N units, this 7-pin transducer slots right into your existing setup. The built-in temperature sensor gives you real-time water temp readings, crucial for dialing in lure choices or tracking thermoclines where big fish hang out. Its rugged composite housing laughs off rocks, logs, and accidental bumps, while the impact-release mounting bracket keeps things secure yet forgiving during those rough trailering days.

What sets it apart? The Dual Spectrum CHIRP operates across a versatile 150-220 kHz range—full coverage from 150-220 kHz, narrow beam at 180-240 kHz for precision, and wide at 140-200 kHz for broad scans. Paired with MEGA Imaging, you get hyper-detailed side views up to 250 feet side-to-side and down views to 75 feet, all without the noise of traditional sonar.

Key Performance Specs at a Glance

Feature Details
Mount Type Transom Mount with Impact-Release Bracket
Sonar-2D Max Depth 1200 feet (365m) Dual Spectrum CHIRP
Side Imaging 455 kHz (800ft range), MEGA SI (1075-1150 kHz, 250ft range)
Down Imaging 455 kHz (125ft), MEGA DI (1075-1150 kHz, 75ft)
Cable Length 20 feet
Pins 7-Pin Connector
Extras Built-in Temp Sensor

Real-World Benefits for Better Fishing Days

  • Spot Hidden Honey Holes: MEGA Side Imaging reveals submerged trees, drop-offs, and wrecks from up to 125 feet on each side, turning guesswork into precision targeting.
  • Vertical Precision: Down Imaging slices straight down, showing fish arches and structure in photo-like clarity—even in murky water.
  • Adaptable 2D Sonar: Switch between wide, narrow, or full CHIRP modes to match conditions, from shallow weedy flats to deep reservoirs.
  • Durability Built-In: The composite build and 20-foot cable handle daily abuse, with easy transom installation that saves time on the water.
  • Temp Tracking: Monitor surface water changes to predict fish movement, especially during turnover seasons.

Quick Setup Tips for Optimal Results

Mount it on your transom about 1/8 inch below the hull bottom for best performance, keeping it clear of strakes or trim tabs. Angle it slightly downward (around 5-10 degrees) to follow the deadrise. Run the 20-foot cable inside the hull or along gunwales, securing it away from electrical noise. Test in shallow water first to fine-tune gain and ensure bubble-free operation. Pro anglers swear by keeping the transducer surface waxed for reduced drag and cleaner signals.

This transducer transforms your HELIX into a fish-finding machine, stacking the odds in your favor for limits every trip. It's not just gear—it's your edge on the water.

Frequently Asked Questions

Is the XNT-9-HW-MSI-150-T compatible with all HELIX models?

It's optimized for HELIX 7 CHIRP MEGA SI GPS G3/G3N and HELIX 8 CHIRP MEGA SI GPS G3N. Always check your unit's specs for MEGA SI compatibility to avoid mismatches.

What's the difference between MEGA SI and standard Side Imaging?

MEGA SI uses higher frequencies (1075-1150 kHz) for finer detail and up to 250 feet of side-to-side coverage, versus 455 kHz's broader but less sharp 800-foot range.

How deep can Down Imaging go with this transducer?

MEGA DI reaches 75 feet, while 455 kHz DI goes to 125 feet—perfect for most freshwater and inshore saltwater applications.

Does it include a temperature sensor?

Yes, the built-in temp sensor provides accurate surface water readings directly on your HELIX display.

Can I use this on a boat with a jack plate?

Absolutely, but adjust the mounting height to keep it submerged consistently, even when jacked up. The impact-release bracket helps prevent damage.

What's the max depth for 2D sonar?

Dual Spectrum CHIRP sonar handles up to 1200 feet, making it versatile for deep-water pursuits.

Is installation DIY-friendly?

Yes, most boat owners handle it themselves. Clean the transom, drill for the bracket, route the cable, and you're scanning in under an hour.

Transom Mount, MEGA Down Imaging, 455 kHz and 1.2 Megahertz hand Dual Spectrum CHIRP 2D Sonar with a CHIRP range of 150 to 220 Kilohertz. features built-in temperature. Compatible with: HELIX 7 CHIRP MEGA SI GPS G3, HELIX 7 CHIRP MEGA SI GPS G3N.

Humminbird 7102971 Attributes

  • Mounting Location: Transom Mount
  • Number Of Pins: 7 Pin
  • Depth: 1200 Feet
  • Frequency Range: 150/ 220 kHz Full Dual Spectrum CHIRP Frequency, 455 kHz/ 1.2 MHz Operating Frequency
  • Cable Length: 20 Feet

Humminbird 7102971 Features & Benefits

  • Dual Spectrum CHIRP Frequencies: Full: 150 To 220 Kilohertz, Narrow: 180 To 240 Kilohertz, Wide: 140 To 200 Kilohertz
  • Dual Spectrum CHIRP Max Depth: 1200 Feet
  • Rugged Composite Design
  • Impact-Release Mounting Bracket And 20 Feet Cable
  • Limited 1 Year Warranty

Humminbird 7102971 Installation Instructions

Humminbird 7102971 Warranties

Humminbird 7102971 Technical Bulletins


XNT-9-HW-MSI-150-T MEGA SI/DI Dual Spectrum CHIRP Transducer with Temp f/HELIX® 7/8 MEGA SI

MEGA Side Imaging Transom Mount Transducer supports MEGA Imaging/455kHz and Dual Spectrum CHIRP 2D Sonar with a CHIRP range of 150-220kHz. Includes built-in temperature sensor, rugged composite design, impact-release mounting bracket and 20' cable. 

Features:

  • This accessory is compatible with the following Humminbird products: HELIX 7 CHIRP MEGA SI GPS G3, HELIX 7 CHIRP MEGA SI GPS G3N. HELIX 8 CHIRP MEGA SI GPS G3N 
  • Dual Spectrum CHIRP Frequencies: Full: 150-220 kHz, Narrow: 180-240 kHz, Wide: 140-200 kHz
  • Dual Spectrum CHIRP Max Depth: 1200ft (365m)
  • Side Imaging Frequencies - Max Range (side-to-side): 455kHz: 440-500 kHz - 800ft (146m), MEGA SI: 1075-1150 kHz - 250ft (76m)
  • Down Imaging Frequencies - Max Depth: 455kHz: 440-500 kHz - 125ft (38m), MEGA DI: 1075-1150 kHz - 75ft (23m)

WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.



The MEGA lateral imaging beam mounted transducer supports MEGA Imaging / 455 kHz and dual-spectrum CHIRP 2D sonar with CHIRP ranging from 150 kHz to 220 kHz. Including built-in...
SKU: NVN-73635
MPN: 710297-1
UPC: 082324053498

Humminbird XNT-9-HW-MSI-150-T MEGA SI/DI Dual Spectrum CHIRP Transducer w/Temp f/HELIX® 7/8 MEGA SI

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