My Account
Shopping Cart

Si-Tex MDA-5 5W SOTDMA Class B AIS Transceiver with Antenna Splitter

Manufacturer

Si-Tex

<h3>About SI-TEX Marine Electronics</h3><p><strong>SI-TEX Marine Electronics</strong> has been a trusted name on the water for over 50 years, building a reputation among commercial captains, charter operators, sportfishermen, and serious recreational boaters for delivering rugged, reliable, and straightforward marine electronics. Founded in 1975 and headquartered in Riverhead, New York, SI-TEX has remained committed to a single mission throughout its history: provide mariners with the features they actually need, the durability they expect, and the value they appreciate.</p><p>What sets SI-TEX apart from larger, more corporate brands is the depth of experience behind every product. President Ted Bodtmann has been shaping marine electronics since 1967, and the leadership team collectively brings decades of hands-on industry knowledge to product design and customer support. That institutional knowledge translates directly into electronics that work the way seasoned mariners expect them to — straightforwardly, dependably, and without unnecessary complexity.</p><h3>A Full Spectrum of Marine Electronics</h3><p>SI-TEX offers one of the most complete lineups in the marine electronics segment. Their product catalog spans professional-grade <a href="/11288-si-tex-simrad-radars-autopilots-200957">radar systems and autopilots</a>, high-performance echo sounders and CHIRP sonar, precision GPS navigation and chartplotting systems, heading sensors, VHF communications, AIS transponders, and more. Whether you&apos;re outfitting a hardworking commercial vessel, a sportfishing yacht, an inshore skiff, or a long-range cruiser, there is an SI-TEX solution engineered for the task.</p><p>Their SVS Series chartplotter/sounder combos — including the SVS-880 and SVS-760 — are especially popular with commercial fishermen and smaller vessel operators, offering high-resolution color displays, powerful sonar capabilities, and intuitive operation in a compact, rugged package. The NavPro series takes things further, pairing large touchscreen MFDs with built-in Wi-Fi radar compatibility, CHIRP sonar, and Navionics or C-MAP charting integration. For vessel control, the SP-120 autopilot series supports hydraulic, mechanical, and dash-drive steering systems across a range of vessel sizes, and even offers virtual feedback to eliminate the need for a rudder sensor on some installations.</p><p>SI-TEX also offers a comprehensive range of accessories and connectivity hardware — including <a href="/11288-si-tex-diagnostic-scan-tool-cable-18035">cable adapters and interface solutions</a> — designed to keep their electronics integrated and upgradeable as technology evolves. These accessories make it easier to expand an existing SI-TEX system or transition between product generations without starting from scratch.</p><h3>Backed by a 2-Year Warranty and U.S.-Based Support</h3><p>Every SI-TEX product is backed by a <strong>2-Year Warranty</strong> and supported by an experienced service team based in Long Island, New York. For mariners who spend serious time on the water, that combination of product durability and accessible support is not a minor detail — it&apos;s a core reason professionals keep coming back to the brand. SI-TEX also distributes Koden products to the commercial marine market, extending their reach to even more demanding commercial and offshore applications.</p><p>From a single transducer cable to a fully integrated radar, chartplotter, and autopilot system, SI-TEX delivers the tools serious mariners rely on — built tough, priced fairly, and backed by people who know the sea.</p>

Part Number

MDA-5
06/03/2036 12:14 PM
Sale Price

$1,157.50

3 left at this price

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Si-Tex MDA-5 is a high-performance 5-Watt SOTDMA Class B AIS transceiver designed for superior vessel tracking and collision avoidance. Unlike conventional Class B AIS units, the MDA-5 features SOTDMA (Self-Organizing Time Division Multiple Access) technology that provides Class A network priority, ensuring your vessel transmits reliably even in congested commercial harbors and ports.

Key Features:

  • 5-Watt transmission power for extended range visibility to other vessels and shore stations
  • SOTDMA technology provides Class A transmission priority in crowded waterways
  • Integrated zero-loss VHF antenna splitter eliminates the need for a separate AIS antenna
  • Built-in 802.11 b/g/n long-range Wi-Fi broadcasts AIS and GPS data to tablets, smartphones, and other devices
  • Dual receivers decode all AIS and DSC messages including MOB (Man Overboard) and SART (Search and Rescue Transponder) signals
  • Built-in GPS and GLONASS receiver for accurate position reporting
  • NMEA-0183, NMEA-2000, and USB connectivity for seamless integration with chartplotters and navigation systems
  • IPX7 waterproof rating for reliable operation in harsh marine environments
  • Ultra-power efficient design with only 220mA average current draw

Technical Specifications:

  • Transmitter Output: 5 Watts
  • Frequency Range: 156.025-162.025 MHz
  • Input Voltage: 9.6-31.2 VDC
  • Operating Temperature: -25°C to +55°C
  • Dimensions: 6.8" W × 5.0" H × 2.0" D
  • Weight: 0.8 lbs
  • Connectors: SO-239 UHF (VHF antenna), TNC (GPS antenna)

Package Includes:

  • MDA-5 AIS transceiver
  • Commercial-grade external GPS antenna with coaxial cable
  • Mounting hardware
  • Power and data interface cable
  • VHF radio connection cable
  • Product information DVD with ProAIS2 software
  • User manual and quick start guide

The MDA-5 is fully certified to IEC-62287-2, FCC, and USCG standards and includes a 2-year manufacturer warranty. Note: FCC regulations require all AIS units sold in the United States to be programmed by a qualified technician with valid MMSI registration documentation.

One of the items that I ordered was damaged by leaking batteries

Shipping process is very convenient

Good Price

Great prices!!

Aver thing I have order has been on time and reasonable price.Thank you.

I wanted to pay with PayPal, but the site would not let me select that payment option

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy