Garmin GT21-TH S/S Thru-Hull ClearV CHIRP, 600W 50/200kHz Traditional, 500W 260 455 ClearV CHIRP [010-01962-10]
Garmin GT21-TH S/S Thru-Hull ClearV CHIRP, 600W 50/200kHz Traditional, 500W 260 455 ClearV CHIRP [010-01962-10]
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GT21-TH
Perfect for coastal and offshore fishermen who want traditional sonar and CHIRP ClearVü scanning sonar with a stainless steel stem, this thru-hull mount transducer consistently displays clear and crisp fish arches with superior target separation as well as clear definition of structure below the boat.
The CHIRP ClearVü element has a power rating of 500 W and operating frequencies of 260/455 kHz. The traditional sonar has a power rating of 600 W and operating frequencies of 50/200 kHz. It includes a built-in fast-response temperature sensor. For hull deadrises less than 25 degrees.
GT21-TH includes an 8-pin transducer with stainless steel stem, fairing block, isolation plate and bushings, mounting hardware and installation instructions. Follow the instructions carefully to avoid damaging your boat.
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.
Specifications:
- Temperature: Yes
- Speed Included: No
- Pins: 8
- Imaging: Standard/Down
- Cable Length (Feet): 30'
- Mounting Style: Thru-Hull
- Chirp: Non Traditional
- Box Dimensions: 6"H x 14"W x 17"L WT: 8.4 lbs
- UPC: 753759152833
Owner's Manual (pdf)

Custom Baits Built by Hand — Not Machines
Every jig head and soft plastic bait is poured, painted, and packed by real anglers. Because crappie fishing deserves more than factory-made bait.
FAITH. FAMILY. FISHING.
Born in South Louisiana, Kill Um’s Jig Co. carries generations of crappie-fishing tradition. From our family’s hands to your line, every bait is made with heart.
Handcrafted. Water-Tested. Slab-Approved.
From mold to water, every jig head and soft plastic we make is designed with purpose — to mimic real baitfish and get bites when the pressure’s on. No shortcuts. Just results.
Testimonials
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The 2" slab snack swims just like the real thing. I’ve been fishing crappie for 20+ years — these baits flat-out catch fish.
Jeremy M., Mississippi -
You can tell these aren’t mass-produced. The jig heads are balanced, sharp, and durable — love supporting a small business that gets it.
—Brittany R., Arkansas -
I’ve used big-name brands for years, but Kill Um’s baits consistently outperform them. Caught my personal best this spring using the Slab Twister!
Derrick S., Louisiana