Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your BOSS Audio Systems MGV520B Marine Gauge Receiver. Designed for marine environments, this unit offers robust performance and versatile media options. Please read this manual thoroughly before use to ensure proper functionality and safety.
Product Overview
The MGV520B is a weatherproof marine gauge receiver featuring a 3-inch LCD display, built-in amplifier, Bluetooth audio streaming, digital media MP3 player capabilities, USB port, and AM/FM radio. It is designed to withstand harsh marine conditions with UV coating and conformal coated PC boards, boasting an IPX6 rating for splash water protection.

Setup and Installation
Professional installation of this product is strongly encouraged to ensure proper and safe functionality. The unit is designed for easy integration into standard gauge openings.
Dimensions
Ensure adequate space for installation. The product dimensions are 4.25” x 7.75” x 5.60”.

Included Components
The package includes the MGV520B receiver and a power harness. Additional accessories like cameras or relays for the accessory button are sold separately.

Operating Instructions
Power On/Off
Press the power button to turn the unit on or off.
Source Selection
Cycle through available media sources: Bluetooth, USB, AM/FM radio, and Auxiliary input.
Audio Control
Adjust volume, skip tracks, and access preset EQ settings via the front panel controls.
Accessory Button
The dedicated accessory button allows you to turn on/off external accessories such as lightbars or LED whips. A relay (not included) is required for this functionality.

Media Integration
Bluetooth Connectivity
Wirelessly play and control music from your smartphone or MP3 player, including apps like Spotify and Pandora.
USB Playback & Charging
The USB port supports audio/video files (up to 32GB max) and provides charging for compatible devices.
AM/FM Radio
Tune into AM/FM radio stations for news, music, and sports. The unit does not include a CD mechanism.
Camera Inputs
The receiver supports video input, allowing you to switch between rear and front cameras (camera sold separately).

Maintenance
The MGV520B is designed with weatherproofing features such as front panel UV coating and conformal coated PC boards, achieving an IPX6 rating. To maintain its performance and longevity, regularly clean the unit with a soft, damp cloth. Avoid using harsh chemicals or abrasive cleaners. Ensure all connections are secure and free from corrosion, especially after exposure to water or salt fog.


Specifications
- Product Dimensions: 4.25 x 7.75 x 5.6 inches
- Item Weight: 0.01 ounces
- Model Number: MGV520B
- Wireless Communication: AM/FM, Bluetooth
- Connectivity Technologies: Auxiliary, Bluetooth, USB
- Special Features: 3 Inch LCD, AM/FM Radio, Built-In Bluetooth, Built-in Amplifier (60 watts x 4 channels), No CD Player, USB Port, Weatherproof (IPX6 rated), Backup Camera Ready, Accessory Button
- Audio Output Mode: Stereo
- Surround Sound Channel Configuration: 4
- Color: Black
Warranty and Support
BOSS Audio Systems provides a powerful 3-year platinum online dealer warranty, valid as long as the purchase is made through Amazon.com. For any questions or support, please refer to the official BOSS Audio Systems website or contact their customer service.






