GT21-TH Thru-Hull Traditional and CHIRP ClearVu Transducer


Temporarily Out of Stock
Email me when in stock, opens dialog
Model # 17596305 | Mfg # 010-01962-10 | UPC # 753759152833

Displays clear and crisp fish arches with superior target separation.

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.

GT21-TH includes an 8-pin transducer with stainless steel stem, fairing block, isolation plate and bushings, mounting hardware and installation instructions.


  • Style: Thru-hull
  • Cable Length: 30'
  • Connector: 8-pin
  • Maximum Deadrise Angle: Up to 25° deadrise
  • Monitors: Depth and Temperature
  • Transmit Power: Traditional 600W; ClearVü 500W
  • Frequency Range: Traditional 50/200kHz; ClearVü CHIRP 260kHz (245-275kHz) and 455kHz (445-465kHz)
  • Max. Depth: Traditional: 1,500'; ClearVü: 1,000'
  • Beamwidths: Traditional (40°/10°); ClearVü (2.0°x 51° @ 260kHz) & (1.4°x 29° @ 455kHz)
 WARNING: Cancer and Reproductive Harm -


GT21-TH Thru-Hull Traditional and CHIRP ClearVu Transducer

Name Value
Beam Traditional 40/10
DownVu 2x51 at 260kHz and 1.4x29 at 455kHz
Connection Interface 8-Pin Connector
Deadrise Angle 0 to 5 Degree
Frequency 50/200kHz+ DownVu CHIRP
Material Stainless Steel
Maximum Depth Traditional 1500 Feet
DownVu 1000 Feet
Sonar CHIRP Sonar
Multiple Beams
Variable Frequencies
Transmit Power 600 Watts Traditional/500 Watts DownVu
Type Thru-Hull


The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.

Related West Advisor Articles


Product Q & A


FREE DELIVERY to West Marine Stores

  • Available for ALL products including hazardous & truck freight items.
  • Ship to over 240 U.S. store locations.
  • Contiguous United States orders arrive in 7 - 10 days.
  • Hawaii and Alaska orders arrive in 10 - 16 days.
  • Expedited shipping is available for an additional fee.
  • Not available in Puerto Rico.

FREE SHIPPING on Orders over $49.00

  • Applicable on orders over $49.00 within the 48 contiguous United States.
  • Does not apply to Truck Freight.
  • No coupon code required.
  • Orders will be delivered within 3 - 7 business days.


We stand behind everything we sell. If at any time your West Marine purchase does not meet your expectations, you can return it for a replacement or refund. If you are a West Advantage Rewards member, you don't even need a receipt - we'll have a record of your purchase. Returns can be made via mail or in person at their nearest store location. If you are not a West Advantage Rewards member, we will first need to verify your purchase by receipt or other method.

We do carry a few items that cannot be returned. This includes: items with expiration dates that have expired such as flares, charts, annual publications; items registered to the user such as boats, motors, EPIRBs, PLBs, SPOT, Class B AIS, life rafts; customized items such as rigging, and boat covers, computer software and electronics charts. Other non-returnable items include carry-on air conditioners, generators and select electronics. We will help you contact the vendor for assistance or repair on product that cannot be returned to West Marine. Items containing hazardous material may only be returned to a West Marine store.

For additional inquiries, you may call Customer Service at 1-800-BOATING (262-8464).