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Garmin ECHOMAP UHD2 74cv with GT20 Transducer vs Garmin GT56UHD-TM Transom Mount Transducer

Updated August 2026 — Garmin ECHOMAP UHD2 74cv with GT20 Transducer wins on mapping features and ease of use, Garmin GT56UHD-TM Transom Mount Transducer wins on installation.

The Garmin ECHOMAP UHD2 offers a comprehensive all-in-one solution, while the GT56UHD-TM excels in advanced sonar capabilities. Choose based on your specific fishing needs.

Why Garmin ECHOMAP UHD2 74cv with GT20 Transducer is better

All-in-One

Includes chartplotter and mapping features

User-Friendly

Bright, sunlight-readable display

Wi-Fi Connectivity

Allows sharing of sonar data and waypoints

Why Garmin GT56UHD-TM Transom Mount Transducer is better

Sonar Performance

Advanced scanning sonar capabilities

Price

Lower price point for advanced features

Versatility

Multiple scanning frequencies for different depths

Overall score

Garmin ECHOMAP UHD2 74cv with GT20 Transducer
85
Garmin GT56UHD-TM Transom Mount Transducer
75

Specifications

SpecGarmin ECHOMAP UHD2 74cv with GT20 TransducerGarmin GT56UHD-TM Transom Mount Transducer
TransducerGT20-TMGT56UHD-TM
Sonar FrequenciesTraditional, ClearVü455, 800, 1000 kHz
Max DepthN/A800 ft
MappingGarmin Navionics+None
InstallationTilt and flush mountTransom and trolling motor mounts

Dimension comparison

Garmin ECHOMAP UHD2 74cv with GT20 TransducerGarmin GT56UHD-TM Transom Mount Transducer

Overview of the Garmin ECHOMAP UHD2 74cv and GT56UHD-TM Transducer

In this comparison, we will look at the Garmin ECHOMAP UHD2 74cv with GT20 Transducer and the Garmin GT56UHD-TM Transom Mount Transducer. The ECHOMAP UHD2 offers a comprehensive fish-finding solution with a built-in chartplotter, while the GT56UHD-TM serves as a powerful transducer. Priced at $699.99, the ECHOMAP UHD2 is about 43% more expensive than the GT56UHD-TM, which is priced at $487.20. Each product brings distinct features to the table, catering to different fishing needs and preferences.

Features and Capabilities

The Garmin ECHOMAP UHD2 is equipped with a 7" chartplotter and comes with the GT20-TM transducer, focusing on providing a user-friendly experience with a bright, sunlight-readable display. Its built-in Garmin Navionics+ mapping ensures you have access to detailed U.S. coastal content. In contrast, the GT56UHD-TM transducer offers advanced sonar capabilities, including Ultra High-Definition SideVü scanning sonar with a 20% greater range at 1000 kHz. This feature allows for more detailed underwater imaging, making it easier to locate fish and structures.

Sonar Performance

When it comes to sonar performance, the GT56UHD-TM excels with its three scanning frequencies: 455 kHz, 800 kHz, and 1000 kHz. This versatility allows for top performance at various depths, with high wide CHIRP traditional sonar providing remarkable clarity and target separation up to 800 feet below the boat. On the other hand, the ECHOMAP UHD2 utilizes the GT20-TM transducer, which offers Garmin traditional and ClearVü scanning sonars, but lacks the advanced features and range of the GT56UHD-TM. Thus, for serious anglers seeking the best sonar performance, the GT56UHD-TM stands out.

Installation and Compatibility

Installation ease is a notable feature for both products. The ECHOMAP UHD2 includes a tilt mount and flush mount hardware, making it straightforward to install on your boat. Similarly, the GT56UHD-TM comes with transom and trolling motor mounts, ensuring compatibility with various setups. However, it's essential to note that the GT56UHD-TM requires a compatible Garmin chartplotter to function effectively, which means users may need to invest in additional equipment. The ECHOMAP UHD2 is a standalone solution, simplifying the buying decision for those who want an all-in-one device.

Mapping and Connectivity

The Garmin ECHOMAP UHD2 features built-in Garmin Navionics+ mapping, providing detailed U.S. coastal content right out of the box. This feature is particularly beneficial for anglers who want to fish in familiar waters without needing to purchase additional maps. Furthermore, the ECHOMAP UHD2 has built-in Wi-Fi, allowing users to share sonar data and waypoints with other compatible Garmin devices, enhancing the fishing experience. In contrast, the GT56UHD-TM does not come with built-in mapping, as it is solely a transducer. Therefore, those looking for integrated mapping will find the ECHOMAP UHD2 more appealing.

Price Comparison

With the ECHOMAP UHD2 priced at $699.99 and the GT56UHD-TM at $487.20, there is a significant price difference of about $212.79. This makes the ECHOMAP UHD2 approximately 43% more expensive than the GT56UHD-TM. While the ECHOMAP offers additional features such as mapping and a display, the GT56UHD-TM provides advanced sonar capabilities at a lower price point. Depending on your budget and needs, the price difference could be a decisive factor when making a purchase.

Sales Rank and Market Position

In terms of market performance, the ECHOMAP UHD2 holds a bestseller rank of 24,342, indicating a solid level of popularity among consumers. The GT56UHD-TM, with a rank of 27,551, is also well-regarded but slightly less popular than the ECHOMAP. This sales data can reflect consumer preferences, which may sway buyers toward the more popular ECHOMAP UHD2 due to its integrated features and user-friendly design.

Which should you buy?

Choosing between the Garmin ECHOMAP UHD2 74cv with GT20 Transducer and the Garmin GT56UHD-TM Transom Mount Transducer ultimately depends on your specific needs as an angler. If you seek an all-in-one solution that includes a chartplotter with built-in mapping and Wi-Fi capabilities, the ECHOMAP UHD2 is the better choice. However, if you prioritize advanced sonar performance and are willing to invest in a compatible chartplotter separately, the GT56UHD-TM offers superior sonar capabilities at a lower price.