What’s the difference between a chartplotter and a fishfinder?

A chartplotter shows your GPS position on electronic charts for navigation. A fishfinder uses sonar to show what’s below the boat — depth, bottom structure, and fish. Many modern units combine both, and networked systems can share data across displays.

Do I really need a VHF radio?

For safety, yes. A VHF radio is the primary way to reach other vessels and the Coast Guard, and a DSC-equipped VHF connected to GPS can transmit your position in an emergency. It’s more reliable than a cell phone offshore and is the recognized standard for marine distress calls.

What is NMEA 2000 and do I need it?

NMEA 2000 is a standard network that lets marine electronics — chartplotter, sonar, autopilot, sensors, engine data — share information over a single backbone. It’s not required for a simple setup, but it makes multi-device systems far easier to expand and integrate.

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SI-TEX

SI-TEX MDA-1 Metadata Class B AIS Transceiver w/Internal GPS - Must Be Programmed

Name: SI-TEX MDA-1 Metadata Class B AIS Transceiver w/Internal GPS - Must Be Programmed
Brand: SI-TEX
SKU: 44717
Price: 769.00 USD
Availability: InStock

Manufacturer: SI-TEXPart #: MDA-1SKU: 44717

$769.00● In stock

Item #: 44717

Category: AIS Systems

● In stock — ships fast from US warehouses

Ships from US warehouses
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Description

MDA-1 Metadata Class B AIS Transceiver **As the FCC requires all units sold in the US to be programmed by a qualified technician. Please submit the form below for programming at time of purchase.

A copy of the MMSI Registration or FCC Ship Station License is required along with the vessel master or owner's signature on the completed programming form. ** Click here to download form .

Utilizes a compact (5. 5"X3.

9"X1. 9") module that is IPx7 Waterproof rated, for flexible location and rugged performance in any marine environment.

Class B AIS Transceiver featuring an Rmax Class B engine that provides maximum range and efficient real-time AIS message processing for all message types. Despite its compact size, the Metadata Class B Transceiver features an internal 50-channel GPS smart antenna, eliminating the need for an external GPS antenna in many installations.

It also features NMEA0183, NMEA2000 and USB connectivity for easy plug-and-play installations on recreational or commercial vessels wanting to send and receive AIS data. Unit will need to be mounted with a clear view of the sky to utilize the internal GPS antenna.

Specifications: Power 12 to 24V DC Power consumption: 150mA @12VDC, Data Interfaces USB NMEA2000 IEC61162-1 (NMEA0183) output, 38400baud IEC61162-1 (NMEA0183) input, 4800baud Silent mode switch input Supplied with 2m power and NMEA0183 cable User manual and quick start guide Product CD Fixing screws This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Specifications

Brand	SI-TEX
Part Number	MDA-1
EverTide SKU	44717
UPC	010407510484
Voltage	24 V

Specifications are provided by the manufacturer. Confirm fitment for your application before ordering, or contact us and we'll help.

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Voltage	24 V	—	24 V	—

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Returns & warranty

Returns are accepted within 30 dayson items that are unused and in their original packaging. Some items may be subject to a manufacturer restocking fee. Special-order items may not be eligible — if you're unsure, ask us before ordering.

SI-TEX productscarry the manufacturer's standard warranty. For a warranty claim or a return authorization, see our full returns policy or contact us.

Marine Navigation & Instruments — frequently asked

What’s the difference between a chartplotter and a fishfinder?: A chartplotter shows your GPS position on electronic charts for navigation. A fishfinder uses sonar to show what’s below the boat — depth, bottom structure, and fish. Many modern units combine both, and networked systems can share data across displays.
Do I really need a VHF radio?: For safety, yes. A VHF radio is the primary way to reach other vessels and the Coast Guard, and a DSC-equipped VHF connected to GPS can transmit your position in an emergency. It’s more reliable than a cell phone offshore and is the recognized standard for marine distress calls.
What is NMEA 2000 and do I need it?: NMEA 2000 is a standard network that lets marine electronics — chartplotter, sonar, autopilot, sensors, engine data — share information over a single backbone. It’s not required for a simple setup, but it makes multi-device systems far easier to expand and integrate.

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