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The Simrad MGL-4 is a professional-grade DGPS (Differential Global Positioning System) Antenna primarily used in commercial maritime applications. It is a dual-purpose “smart” antenna that combines a GPS receiver with a Beacon receiver to provide highly accurate, corrected positioning data.
The MGL-4 was widely used with the following systems:
Simrad/MX Marine: CX44, CX54, CA, CE, and SP series Multi-Function Displays.
Saab: R4 DGPS Navigation Sensors.
Note on Obsolescence: The MGL-4 has been largely succeeded by the Simrad MX521B and the MXB5 patch antenna. If your MGL-4 fails, the MXB5 is often cited as the direct electronic replacement, though you may need to verify cable connector compatibility.
| Feature | Details |
| Type | Combined GPS and Beacon Differential Antenna |
| Accuracy | Better than 2 meters (with DGPS/Beacon fix) |
| Input Voltage | 10.5V to 32V DC (Powered via the display unit) |
| Mounting | Standard 1″-14 TPI marine thread (standard antenna mount) |
| Connectivity | Typically uses an 8-pin or 10-pin specialized marine cable |
| Durability | Fully waterproof (IPX6/7 equivalent) for mast-head mounting |
| Category | Specification |
| Model Number | MGL-4 (Legacy Part: 727051) |
| Technology | 12-Channel GPS + 2-Channel Beacon Receiver |
| Position Accuracy | < 2 meters (with DGPS/Beacon fix) |
| Interface Protocol | NMEA 0183 ($RS-422$) |
| Voltage Input | 10.5V to 32V DC |
| Power Draw | ~300mA at 12V DC |
| Mounting | Standard 1″-14 TPI marine thread |
| Status Indicator | Integrated LED (visible on some versions/connectors) |
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