Is the sidescan of the transduce of this unit half and half? means front half for port side(so not blocked by engine), rear half for starboard side?

No, port and starboard out as far as you set. Depending on depth of water, distance can be 20 to several hundred feet port or starboard

Transducer cable length

I didn't measure it but it should be 25 feet long. On my 18' boat the cable reaches from the bow all the way back to the stern transom mount location with some extra length. The installation manual states "If your transducer cable is not long enough to reach the chartplotter, you can add an extension cable (Garmin part number 010-11617-42 or 010-11617-32, not included). To avoid signal degradation, do not extend the cable more than 9 m (30ft.).

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255.17 OMR

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Description

🎯 See More, Catch More – Dominate the Depths with Garmin ECHOMAP UHD!

360 SCANNING POWER - Three sonar frequencies (455, 800, 1000 kHz) combined with 500 watts ensure top performance in all water conditions.
UNMATCHED DEPTH PERFORMANCE - High wide CHIRP sonar delivers razor-sharp target separation up to 800 feet below your boat.
CRYSTAL CLEAR UNDERWATER VISION - Ultra High-Definition SideVü sonar with 20% greater range at 1000 kHz reveals fish and structure like never before.
EFFORTLESS INSTALLATION VERSATILITY - Includes transom and trolling motor mounts for quick setup and flexible mounting options.
VIVID COLOR PALETTES FOR INSTANT CLARITY - Easily distinguish fish and underwater structures with vibrant, easy-to-read sonar color schemes.

The Garmin ECHOMAP UHD marine transducer delivers ultra high-definition sonar imaging with a 20% greater range at 1000 kHz, providing crystal-clear underwater views up to 800 feet deep. Featuring three scanning frequencies and 500 watts of power, it ensures superior target separation and clarity on both sides of your boat up to 500 feet. Its vivid color palettes and easy installation options make it the ultimate tool for serious anglers seeking precision and performance.

Specifications

ASIN	B08LF4JDSJ
Best Sellers Rank	759,148 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 1,616 in Marine Electronics
Brand Name	Garmin
Customer Reviews	4.6 4.6 out of 5 stars (232)
Display	LCD or LED
Included Components	12-pin transducer; Transom and trolling motor mounts; Mounting hardware; Documentation
Item Dimensions L x W x H	32.8L x 27.9W x 11.2H centimetres
Item Type Name	Marine transducer
Item Weight	3 Pounds
Manufacturer	Garmin
Manufacturer Part Number	010-13073-00
Maximum Measuring Depth	500 Feet
Model Name	Gt56uhd-tm
Model Number	010-13073-00
Mounting Type	Transom and Trolling Motor Mounts
Power Source	Corded Electric
UPC	753759269302

Reviews

A**R

very nice transducer picks up very clear images

1.08.2023

L**Z

muy buen producto

7.04.2022

A**E

It does what it says

29.06.2025

Y**N

Super bien mais je l ai pas installé encore ca vas aller au printemps

6.01.2026

S**A

As advertised

17.03.2026

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TrustScore 4.5 | 7,300+ reviews

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