Minn Kota Ulterra QUEST 90/115 Trolling Motor — Dual Spectrum CHIRP — 72" Shaft

Auto Stow & Deploy. Power Trim. QUEST Brushless Power. Built-In Dual Spectrum CHIRP. Maximum Shaft Length for Large Freshwater Boats.

The Minn Kota Ulterra QUEST 90/115 with Dual Spectrum CHIRP and 72" shaft is the longest-shaft configuration in the Ulterra QUEST lineup — engineered for large freshwater boats with high bow profiles where shorter shafts can’t maintain consistent propeller depth in rough water or strong current. If your boat has a high bow, you fish large open-water lakes, or you regularly deal with significant wave action, the 72" is the correct shaft.

Browse all shaft lengths: 45" — 60" — 72" (this product)

Browse the full Minn Kota Ulterra QUEST lineup →

Start Here: Is the 72" Shaft Right for Your Boat?

My Boat Is…	72" Shaft?
Over 24 ft with a high bow profile	✅ Yes — this is your shaft
18–24 ft with a moderate bow profile	Consider the 60" shaft
Under 18 ft or a smaller bass boat	Consider the 45" shaft
Prefer MEGA Side Imaging over CHIRP	See the Ulterra QUEST MEGA Down/Side Imaging — 72"

Why Choose Built-In Dual Spectrum CHIRP?

Built-In Dual Spectrum CHIRP provides outstanding traditional sonar performance with excellent fish separation, bottom detail, and target clarity. It’s an ideal choice for anglers who already use Live Sonar, don’t need Side Imaging, or simply prefer a cleaner, more cost-effective electronics setup — while still benefiting from the Ulterra QUEST’s premium automation and GPS features.

Humminbird’s CHIRP technology uses a broad frequency range to deliver more detailed returns than traditional fixed-frequency sonar. The result is sharper fish arches, better bottom definition, and superior target separation at depth — especially in the deep water column where MEGA Side Imaging loses its advantage.

Why Built-In CHIRP Matters

• Superior fish target separation at depth — distinguish individual fish from each other and from structure where traditional sonar blurs the picture
• Clear fish arches — precise fish identification even in deep water columns
• Enhanced bottom detail — clearly define hard vs. soft bottom, rock transitions, and subtle structure changes
• Dual spectrum operation — wide beam for broad coverage, narrow beam for precise depth targeting
• Ideal pairing with Live Sonar — if you already run Humminbird MEGA Live or Garmin LiveScope, CHIRP complements Live Sonar without redundancy
• Lower overall system cost — CHIRP version is priced below the MEGA imaging version; savings can go toward your Humminbird display or battery system
• Protected transducer integrated into the lower unit — no exposed transducer to snag weeds or damage on launch
• Cleaner installation — motor and sonar share a single cable run to your Humminbird display

CHIRP vs. MEGA Side Imaging — Which Is Right for You?

If You Want…	Best Choice
Traditional sonar performance with superior depth detail	✅ Dual Spectrum CHIRP (this product)
Side Imaging of structure, timber, and flats	MEGA Down/Side Imaging — 72"
Maximum imaging detail and wide-area scanning	MEGA Down/Side Imaging — 72"
Lower overall system cost	✅ Dual Spectrum CHIRP (this product)
Already own Live Sonar (MEGA Live, LiveScope)	✅ Dual Spectrum CHIRP (this product)
Deep water vertical jigging and suspended fish	✅ Dual Spectrum CHIRP (this product)
Scanning brush piles, standing timber, offshore structure	MEGA Down/Side Imaging — 72"

Note: Dual Spectrum CHIRP requires a compatible Humminbird fish finder to display sonar. Contact us if you need help confirming compatibility with your existing electronics.

Why Choose the Ulterra QUEST Instead of the Instinct QUEST?

Both the Ulterra QUEST and the Riptide Instinct QUEST share Auto Stow & Deploy, Power Trim, and the QUEST brushless platform. The key differences are environment and sonar integration.

Feature	Ulterra QUEST	Riptide Instinct QUEST
Water type	Freshwater	Saltwater (Riptide-rated)
Integrated sonar	Dual Spectrum CHIRP or MEGA Down/Side Imaging	No integrated sonar
Auto Stow & Deploy	Yes	Yes
Power Trim	Yes	Yes
QUEST brushless motor	Yes	Yes
Spot-Lock with Jog	Yes	Yes
One-Boat Network	Yes	Yes
Best for	Tournament bass, walleye, muskie, Great Lakes, freshwater structure fishing	Saltwater inshore, offshore center consoles, coastal fishing

If you fish freshwater and want integrated CHIRP sonar, the Ulterra QUEST is the correct motor. If you fish saltwater, see the Minn Kota Riptide Instinct QUEST lineup.

Best For — Freshwater Fishing Applications

The Ulterra QUEST 90/115 with Dual Spectrum CHIRP and 72" shaft excels in:

• Large freshwater boats with high bow profiles — the 72" shaft keeps the propeller submerged in rough water where shorter shafts ventilate
• Great Lakes fishing — open-water wave action demands maximum shaft depth for consistent thrust and Spot-Lock performance; CHIRP delivers superior target separation at depth
• Deep water vertical jigging — CHIRP’s superior target separation identifies suspended fish and structure at depth with precision
• Muskie and walleye fishing on large impoundments — maximum thrust (115 lb on 36V) for controlling large boats in wind and current
• Anglers running Live Sonar — CHIRP complements MEGA Live or LiveScope without redundancy

Why the Ulterra QUEST — Full Feature Set

• Auto Stow & Deploy — fully automatic with a single button press; no manual lifting required
• Power Trim — raise or lower motor depth electronically without leaving your seat
• QUEST Brushless Motor — more torque, better efficiency, quieter operation, less maintenance than brushed alternatives
• Dual-Voltage Operation — 90 lbs on 24V, 115 lbs on 36V from a single motor
• Spot-Lock with Jog — GPS anchoring that holds position within feet; adjust in precise 5-foot increments
• Drift Mode — controlled drift speed and direction compensation for walleye and multi-species presentations
• Advanced GPS AutoPilot — heading lock and course correction
• One-Boat Network — full integration with compatible Humminbird fish finders
• Digital Maximizer — up to 5x longer battery runtime
• Wireless Remote — full motor control from anywhere on the boat
• Programmable Heel-Toe Electric Foot Pedal — included; hands-free steering and speed control

Voltage & Battery Recommendations

Voltage	Thrust	Best For
24V	90 lb	Lighter boats in moderate conditions; two 12V batteries
36V	115 lb	Large boats, rough water, demanding conditions; three 12V batteries — strongly recommended for this shaft length

We recommend pairing with lithium batteries for lighter weight, longer runtime, and faster charging. AGM is also compatible. Contact us for a complete battery system recommendation for your boat.

Complete Your Setup

TrollingMotors.shop is a complete-system provider — not just a motor retailer. Here’s what we recommend pairing with the Ulterra QUEST 90/115 Dual Spectrum CHIRP for a fully integrated freshwater setup:

Humminbird Displays (One-Boat Network Compatible)

• Humminbird HELIX series — entry to mid-level; excellent CHIRP performance at a lower price point
• Humminbird XPLORE series — mid-range with full One-Boat Network integration and MEGA imaging capability
• Humminbird APEX series — premium performance with full networking, MEGA Live, and multi-display capability
• Humminbird SOLIX series — flagship; maximum display size and processing power for serious tournament anglers

Battery Systems

• Abyss Lithium Batteries — 100Ah lithium (x2 for 24V, x3 for 36V) for maximum runtime and minimum weight
• AGM Deep Cycle Batteries — reliable and cost-effective alternative

Charging & Electrical

• Minn Kota Precision Charger — onboard charging optimized for your battery chemistry and voltage configuration
• 60A Circuit Breaker — required for proper motor protection

Mounting & Accessories

• Quick-Release Bracket — Minn Kota RTA-62 for fast motor removal and installation

Contact us before you order and we’ll build the right complete system for your boat, budget, and fishing style.

Specifications

Specification	Details
Thrust	90 lb (24V) / 115 lb (36V)
Voltage	24V / 36V selectable
Shaft Length	72"
Motor Technology	QUEST Brushless
Deploy System	Auto Stow & Deploy
Depth Adjustment	Power Trim
GPS Anchoring	Spot-Lock with Jog
Sonar	Dual Spectrum CHIRP (integrated)
Network	One-Boat Network (Humminbird compatible)
Control	Wireless Remote + Heel-Toe Foot Pedal (both included)
Mount	Bow Mount — Electric Steer
Water Type	Freshwater
Shaft Material	Indestructible Composite (lifetime warranty)
Motor Warranty	3-Year Limited

What’s Included

• Minn Kota Ulterra QUEST 90/115 Trolling Motor
• Wireless Remote
• Programmable Heel-Toe Electric Foot Pedal
• Integrated Dual Spectrum CHIRP Transducer
• Heading Sensor
• Weedless Wedge Propeller
• Mounting Hardware
• Owner’s Manual

Learning Center

• Spot-Lock with Jog — How It Works
• Drift Mode — How It Works
• Follow Mode — How It Works
• QUEST Brushless Technology — What It Means and Why It Matters
• One-Boat Network — What It Is and How to Use It
• Real-Time Battery Monitoring — How It Works
• Trolling Motor Shaft Length Guide

Frequently Asked Questions

What is the difference between Dual Spectrum CHIRP and MEGA Side Imaging?

Dual Spectrum CHIRP delivers superior 2D sonar target separation at depth — ideal for identifying suspended fish, deep structure, and bottom composition with precision. MEGA Side Imaging provides high-resolution, wide-area scanning to both sides of the boat, making it better for locating fish and structure quickly across a large area. If you primarily fish deep water vertically or already run Live Sonar, choose CHIRP. If you scan flats, timber, and offshore structure, see the MEGA Down/Side Imaging — 72" version.

Does this model include a foot pedal?

Yes. The Ulterra QUEST includes both a programmable heel-toe electric foot pedal and a wireless remote, giving you multiple control options from anywhere on the boat.

Can this motor run on both 24V and 36V?

Yes. The Ulterra QUEST 90/115 is a dual-voltage platform — 90 lbs on 24V, 115 lbs on 36V. For large boats at this shaft length, we strongly recommend 36V for maximum thrust and runtime.

What size boat is the 72" shaft best suited for?

The 72" shaft is designed for large freshwater boats over 24 ft with high bow profiles, or for anglers who regularly fish in open-water conditions with significant wave action — such as the Great Lakes. For most 18–24 ft boats, the 60" shaft is the better choice.

Is CHIRP a good choice if I already run Live Sonar?

Yes — this is one of the best use cases for the CHIRP version. If you already run Humminbird MEGA Live or a similar Live Sonar system, Dual Spectrum CHIRP complements it without redundancy.

Is this motor saltwater-rated?

No. The Ulterra QUEST is a freshwater motor. For saltwater use, see the Minn Kota Riptide Instinct QUEST lineup.

What quick-release bracket fits this motor?

The Minn Kota RTA-62 Quick Release Bracket is compatible with the Ulterra QUEST.

Why Buy From TrollingMotors.shop?

✅ Authorized Minn Kota Dealer — Full factory warranty on every motor we sell.
✅ Expert Product Recommendations — We help you choose the right motor, shaft length, battery system, and Humminbird display for your specific boat and fishing style.
✅ Free Shipping on Qualifying Orders — Fast, nationwide delivery on most trolling motors.
✅ Complete System Recommendations — We don’t just sell motors. We help you build the right setup.
✅ Trolling Motor Specialists — This is all we do. We know these products inside and out.