GC20 Multi-GNSS compass | Satellite Compass with 1° Heading Accuracy | GNSS Compass

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GC20 Satellite Compass – 1° RMS Heading Accuracy with 20cm Baseline for Radar and Autopilot Integration

nFor vessel operators needing reliable true heading data without the maintenance of a magnetic or gyro compass, the GC20 satellite compass delivers 1° RMS heading accuracy using multi-constellation GNSS (GPS/GALILEO/BEIDOU/GLONASS (optional)) with front-end carrier phase decoding technology. The 20cm baseline antenna design and built-in gyro compensation provide stable heading performance even during vessel turns or in rough sea conditions.
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Why Upgrade from a Magnetic Compass to the GC20 Satellite Compass

nNo mechanical parts, zero maintenance – Unlike traditional compasses with moving parts, the GC20 has no mechanical components. No calibration, no yearly servicing, no repeating costs.
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nTrue heading, not magnetic – Provides true north heading directly from satellite data. No deviation correction tables needed for different vessel headings or steel hulls.
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n1° RMS heading accuracy – Reliable enough for radar target tracking, autopilot navigation, and sonar/echosounder integration. The 0.4° RMS pitch/roll data also supports stabilizer systems.
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n20cm baseline length – Compact antenna housing (315mm x 142mm x 140mm) fits on smaller vessels where traditional 1m or 2m compass antennas are impractical.
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Performance Specifications at a Glance

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Making Your Onboard Equipment Perform Better

nThe GC20 enhances radar, fish finders, sonar, and autopilots with accurate speed and true heading data.
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nFor radar users – True echo trails display your vessel’s movement and the movement of other targets smoothly, without the jagged, zig-zag appearance common from high-deviation magnetic compasses. Accurate heading data ensures target trails are displayed smoothly and accurately.
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nFor autopilot systems – The built-in gyro compensation system and advanced speed/heading filtering technology provide stable heading data during turns. Fast heading update rates allow autopilots to respond quickly to course changes.
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nFor fish finders and sonar – Accurate heading and speed data improves bottom lock stability and corrects for vessel motion, keeping fish arches sharp on the display.
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Fast Signal Processing for Real-World Conditions

nFast cold start (≤32s) – Get heading and position quickly after power-up
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nQuick reacquisition (≤1s) – Recovers heading immediately after signal interruption (bridges, overhead obstructions)
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nHigh turn rate capability – Maintains heading lock during rapid vessel maneuvers
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Optional Remote Display (Color Touch Screen)

nSelect the optional 5-inch color touch screen remote display (800×480 resolution) for bridge installation. Two display modes available:
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nCompass mode – Traditional analog compass display with digital heading readout
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nDigital mode – Large numeric heading, speed, and position data
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nThe remote display can be mounted at a secondary steering station or flybridge while the main GC20 antenna remains at the masthead.
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Data Output – Standard Marine Protocols

nStandard NMEA0183 and NMEA2000 outputs connect directly to:
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nRadar systems
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nChart plotters / Multifunction displays
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nAutopilots
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nFish finders
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nSonar systems
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nOutputs include true heading, position (lat/lon), speed over ground (SOG), course over ground (COG), rate of turn, pitch, roll, and heave.
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Installation and Placement

nThe compact GC20 antenna (315mm x 142mm x 140mm) installs without a metal deck plate or binnacle. Mount on any clear view of the sky:
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nMasthead
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nRadar arch
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nT-top
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nHardtop
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nNo calibration or compensation required after installation. The IP56-rated antenna withstands jet water spray and heavy seas.
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What’s Included in the GC20 Package

nGC20 GNSS antenna/sensor unit (20cm baseline)
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nMounting bracket and hardware
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nInterface cable
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nDocumentation
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nOptional: 5-inch color touch screen remote display (specify when ordering)
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nTechnical parameters：
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