The big difference is that the GT23M-TM adds ClearVü scanning sonar, while the GT15M-TM is traditional CHIRP sonar only.
In Summary
- GT15M-TM = best if you only want strong traditional sonar/fish arches and depth performance.
- GT23M-TM = better all-rounder because you also get ClearVü structure imaging. Most anglers choose this if their unit supports it.
Compared Products
Mid-CHIRP traditional sonar transducer focused on clean fish arches and depth performance without scanning sonar.
| Feature | ||
|---|---|---|
| Traditional CHIRP sonar | Yes | Yes |
| Power | 600 W | 600 W |
| Frequency | Mid-CHIRP (85–165 kHz approx.) | Mid-CHIRP + ClearVü |
| ClearVü imaging | No | Yes |
| SideVü | No | No |
| Fish arches | Excellent | Excellent |
| Bottom separation | Very good | Very good |
| Structure detail | Basic | Much better |
| Offshore/deeper water | Good | Better overall |
| Best use case | Simple sonar setup | Full-featured fishing setup |
| Price | Cheaper | More expensive |
The GT23M-TM uses traditional CHIRP plus ClearVü frequencies around 260/455 kHz for detailed bottom and structure imaging.
The GT15M-TM is focused on mid-band CHIRP traditional sonar with good target separation and depth capability up to roughly 1,900 ft.
Which one to Choose
Choose the GT15M-TM if:
- You mainly troll or bottom-fish
- You just want clean arches and depth
- You want the cheaper option
- Your fishfinder is a CV/non-scanning model
Choose the GT23M-TM if:
- You fish reefs, ledges, pinnacles or wrecks
- You want to identify structure clearly
- You fish estuaries or shallow reefs
- Your Garmin unit supports ClearVü
- You want more future-proof capability
For kayak fishing and inshore saltwater fishing around the Wild Coast, the GT23M-TM is usually the better buy because structure detail helps a lot when locating reefs and bait. The GT15M-TM is still excellent if you only care about traditional sonar performance.
One important note:
- The GT23M-TM does not include SideVü.
- If you want side scanning, look at a GT52/GT54/GT56 instead.
Final Thoughts
In conclusion, both the Garmin GT15M-TM and GT23M-TM are excellent 600W transducers that deliver reliable CHIRP sonar performance, but the right choice comes down to your fishing style and sonar needs. The GT15M-TM is ideal for anglers who want simple, dependable traditional sonar with great target separation, while the GT23M-TM offers added versatility through ClearVü imaging for identifying reefs, structure and bait more clearly. If your Garmin unit supports ClearVü and you want a more advanced all-round fishing setup, the GT23M-TM is the better long-term investment.
For more information on the above transducers, feel free to contact us at Wild Coast Kayaks.
