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Raymarine

R70521

Mounting bracket for RV-100 display

The Raymarine R70521 mounting bracket is an essential accessory for installing the RealVision™ 3D RV-100 sonar transducer on the transom. It provides a mechanically stable mount for optimal sonar performance by reducing turbulence-related interference. This product includes the bracket and all necessary mounting hardware.

Retail priceBenefit from the professional rate

£47.44 GBP

£47.44 GBP ~~£56.16 GBP~~

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Prices exclude import taxes (indicative rate: UK import VAT 20%). DAP delivery: import taxes are paid on delivery.

In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

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Request a quote

Installers near you

thanks to our network of approved installers

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Support service

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Technical specifications

Compatible model	Raymarine RV-100 RealVision 3D rear-mount fishfinder
Mounting type	Rear panel installation
Material	Composite/fiberglass
Product type	Mounting bracket / transducer mount
Compatible models	Raymarine RV-100, A80464
Beam coverage angle	3D: 180°, DownVision: 60°, conical: 25°
Cable length	8.0
Compatible displays	Raymarine Axiom, Axiom+, Axiom Pro, Axiom2 Pro (with LightHouse 3 software)
Integrated speed sensor	No
Integrated temperature sensor	Yes
Max depth reading	274.0
Operating temperature	-2 to +55
Sonar connector type	25-pin RealVision
Supported sonar technologies	RealVision 3D, DownVision, SideVision, CHIRP
Warranty	2.0

Detailed description

Designed for installing the Raymarine RV-100 RealVision™ 3D transducer, the R70521 rear-mount bracket is the standard solution for secure attachment to the transom of vessels. This accessory ensures stable and precise positioning of the transducer, essential for optimizing 3D sonar, DownVision, SideVision, and CHIRP data collection.

Sonar positioning and optimization

The R70521 bracket allows installation of the RV-100 transducer to minimize interference from turbulence and aeration. Proper positioning is critical for sonar image quality and detection of underwater structures. Installation requires selecting a location away from propellers to avoid wakes, and from hull elements such as chines, ribs, rivet rows, or strakes that can generate disturbances.

Integration and mounting alternatives

Unlike specific mounts such as other dedicated mounts (e.g., for trim cylinders or hull/chine), the R70521 is optimized for standard transom configurations. It is the default choice for boats with a transom offering sufficient and undisturbed space for the transducer, ensuring nominal performance of the RealVision™ 3D system.

Documentation

Type	Nom
	EN - Plan technique - Etrier de montage tableau RV-100
	EN - Technical Drawing - RV-100 Mounting Bracket
	EN - Technical Drawing - RV-100 Hull Mount Bracket
	EN - Technical Drawing - RV-100 Panel Mounting Bracket
	FR - Plan technique - Etrier de montage tableau RV-100
	EN - Technical drawing - RV-100 panel mounting bracket

Expert opinion

Pol CONIN

Digital Manager

« Optimizing the installation of the RV-100 transducer on the transom »

The R70521 transom-mount bracket is the essential accessory for installing the Raymarine RV-100 RealVision™ 3D transducer on traditional transoms. Its practical value is clear for outboard or inboard/outboard-powered boats where the hull design allows for a direct and unobstructed installation. This is the preferred solution when hull constraints do not require a specific mount such as a jack plate or transom-hung trim tab.

Installing this bracket requires careful attention to positioning to avoid turbulence sources (propellers, chines, etc.) that could degrade sonar image quality. Precise drilling and the use of marine-grade polyurethane sealants are essential to maintain hull integrity. This bracket stands out for its simplicity and effectiveness in standard installations, offering an optimal balance between ease of installation and preservation of RealVision™ 3D sonar performance.

Note that the R70521 is not recommended for transoms that are excessively recessed relative to the propellers or in environments with significant structural turbulence. In such configurations, alternative mounting solutions (e.g., for jack plates or transom-hung trim tabs) would be more appropriate to preserve sonar signal integrity.

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Mounting bracket for RV-100 display

£47.44 GBP

£47.44 GBP ~~£56.16 GBP~~

Frequently Asked Questions

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What is the RV-100 R70521 transom-mount bracket used for?

The R70521 transom-mount bracket is an accessory designed for the secure installation of the Raymarine RV-100 RealVision™ 3D sonar transducer. It allows mounting this transducer on the transom of vessels, ensuring stable and precise positioning.

Which transducer model is this bracket compatible with?

This flush-mount bracket (reference R70521) is specifically designed for optimal compatibility with the Raymarine RV-100 RealVision™ 3D sonar transducer.

What are the important criteria for choosing the installation location of the transducer with this bracket?

For optimal sonar performance, location choice is critical. The following criteria must be met:

Select an area with minimal turbulence and aeration. Position the transducer away from propellers to avoid wash. Avoid hull features such as chines, ribs, rows of rivets, or strakes, as they can cause disturbances. Ensure the transom provides sufficient and undisturbed space for the transducer.

Which type of sealant should I use for the installation?

You must use only marine-grade polyurethane sealants with neutral curing. It is imperative not to use sealants containing acetate or silicone, as these substances can damage plastic components of the equipment.

Is it recommended to have this bracket installed by a professional?

Yes, Raymarine strongly recommends installation by a Raymarine-certified installer. Certified installation may entitle you to enhanced product warranty benefits.

How does this bracket contribute to the performance of the RealVision™ 3D sonar?

The R70521 bracket is designed to optimize sonar performance by ensuring stable and precise positioning of the RV-100 transducer. This is essential for reducing interference caused by turbulence and aeration, ensuring high-quality 3D sonar, DownVision, SideVision, and CHIRP data collection.

Can I test the RV-100 transducer with this bracket out of the water?

No, the transducer must be tested and used only when fully immersed in water. Operating it out of the water can cause overheating and potentially damage the device.

Are there other mounting options for the RV-100 transducer?

Yes, in addition to the R70521 transom-mount bracket, which is the standard option for transom installations, the RV-100 transducer can be mounted using other specific brackets. These options include the jack plate mount (reference A80480) and the hull/step mount bracket (reference A80479), suitable for different vessel configurations.