MD97TMC: Transmitting Magnetic Compass (TMC) System

REF: MNE-0027

SKU: MNE-0027


The MD97TMC is a Transmitting Magnetic Compass (TMC) System that detects and also, transmits the ship’s Compass Heading over a NMEA 0183 digital connection to one or more Heading Repeaters (Compass Repeaters) at any convenient location on a vessel.
The Calibration Control and Sensor Processor is used to calibrate the Compass Sensor. This is done by turning the ship through 390°. The latest technology accurately processes and also converts the compass card position to NMEA 0183 Heading Data.
The Marine Data MD97TMC Transmitting Magnetic Compass System is intuitive to use. Additionally, with quick and easy installation.


  • Provides Digital Heading Data from a Ship’s Magnetic Compass
  • Simplified system design with just two main components
  • Unparalleled Accuracy; Intuitive Operator Controls
  • Automatic Sensor-to-Compass Calibration
  • Rugged, IP65 rated Magnetic Sensor
  • 2x NMEA 0183 outputs


  • Provides 2 digital NMEA heading outputs to drive Heading Repeaters (or other devices) at a convenient location
  • An elegant alternative to using an optical reflector in a ship’s magnetic compass installation

ACCESSORIES – For accessories quote please email

  • MD71THD – Control & Display unit provides additional functionality
  • MD54 – Compass Sensor Adhesive Mount
  • MD58 – Compass Sensor Bracket Mount


Increasingly, Maritime Authorities are

accepting the use of Transmitting Heading

Device (THD) Systems onboard vessels.


Marine Data offers two types of THD system:

•         A system which senses the angular position of a ship’s magnetic compass card; known as a Transmitting Magnetic Compass System (TMC)

•         A system which directly senses the Earth’s magnetic field; known as an Electro-Magnetic Compass System (EMC)

By Marine Data

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Item Measurements
MD97CSP: L 146; W 64; D 41 (mm); 0.35 kg MD52A/B: H 18; Ø 69 (mm); 0.12 kg Excludes cables & connectors
Data Sheet

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