Gyro Repeater Converter
Scandinavian Micro Systems AS
Refurbished
The Scan Repeater SR03-01, manufactured by Scandinavian Micro Systems, is a marine heading conversion and repeater-drive unit developed to connect digital gyrocompass heading signals to traditional mechanical repeater systems.
The photographed equipment is an earlier SR03-01 Universal NMEA to Synchro Unit. The modern successor, SR03-01Mk2, expands this concept as a Universal NMEA to STEP/SYNCHRO Converter & Drive Unit.
Its main advantage is simple: when a ship replaces an old gyrocompass with a modern gyro or satellite heading source, the existing mechanical repeaters may still be perfectly serviceable. Instead of replacing all of them, the SR03 converter can translate modern NMEA heading data into the older STEP or SYNCHRO signals those repeaters require.
Manufacturer: Scandinavian Micro Systems AS
Product Family: Scan Repeater
Photographed Model: SR03-01
Current Model: SR03-01Mk2
Product Type: Universal NMEA to STEP/SYNCHRO Converter & Drive Unit
Country of Origin / Manufacturer: Norway
Marine Application: Gyrocompass retrofit, heading conversion and mechanical repeater drive
Input: NMEA heading data
Output: STEP and/or SYNCHRO depending on installation
Power Supply – Current Mk2: 24 VDC, 18–32 VDC range
Approval – Current Mk2: Tested to IEC 60945
Older vessels often distribute heading using electrical synchro or step-by-step signals.
A modern gyrocompass, however, usually provides digital serial heading data such as NMEA.
Without a converter, this creates a compatibility problem:
New Gyrocompass → NMEA Digital Heading → OLD Mechanical Repeater Cannot Read It
The SR03 solves that problem:
New Gyro / Satellite Compass → NMEA Heading → SR03-01Mk2 → STEP / SYNCHRO → Existing Mechanical Repeaters
Scandinavian Micro Systems specifically promotes the Mk2 for gyro replacement projects because existing repeater cabling, ARPA radars, autopilots and mechanical repeaters can potentially remain in service rather than being replaced simply because the gyro source has changed.
The current Mk2 can:
The manufacturer also states that the unit can be applied to compatible mechanical speed displays and mechanical wind indicators, which broadens its usefulness beyond only gyro repeaters.
According to the official Scandinavian Micro Systems datasheet:
Supply Voltage: 24 VDC nominal, 18–32 VDC
Maximum Supply Current: 16 A
Synchro Reference: Adjustable approximately 1–110 VAC
Synchro Phase Voltage: Adjustable approximately 0–90 VAC
Synchro Frequency: 50 / 60 / 400 / 500 Hz selectable
Synchro Maximum Rate of Turn: 20°/sec
Synchro Load: Up to approximately 150 W
Typical Repeater Capacity: Approximately 12 mechanical repeaters
Angular Accuracy: Better than ±0.4° for 1X, typical ±0.2°
Operating Temperature: -15°C to +55°C
Storage Temperature: -20°C to +70°C
Standard: IEC 60945 tested/approved
The manufacturer notes that actual power consumption depends on connected repeater load.
One of the strongest features of the current SR03-01Mk2 is support for two separate heading sources.
For example:
Gyro No.1 → NMEA Input 1
Gyro No.2 → NMEA Input 2
The unit compares both headings. If their difference exceeds the configured alarm limit, it can generate a Compass Compare Alarm.
The manufacturer also documents an approved switch-over function, allowing the selected heading source to be changed.
This is valuable on ships where heading reliability affects:
Radar • ARPA • Autopilot • Repeaters • Navigation Displays • Other Heading-Dependent Equipment
Scandinavian Micro Systems' retrofit drawing shows a particularly useful arrangement:
New Gyrocompass → NMEA → SR03-01Mk2 → Existing Repeater Distribution Unit → Existing Mechanical Repeaters
The manufacturer specifically shows that old mechanical repeaters and existing distribution wiring may remain, while the old gyro is removed.
This can significantly reduce:
Installation Work • Cable Replacement • Bridge Modifications • Equipment Replacement • Vessel Downtime
If the SR03-01Mk2 is installed in a gyro room or another technical area, Scandinavian Micro Systems offers the SR03-03 Remote Control Unit.
The SR03-03 can be located on the bridge, allowing the Officer of the Watch to monitor and control the SR03-01Mk2 remotely.
Related manufacturer products also include:
SR03-04 – STEP/SYNCHRO Distribution Unit
SR03-05 – Manual STEP/SYNCHRO Switch-Over Unit
SR01-40 – STEP, SYNCHRO & LOG to NMEA Converter
SR01-60 – 1X Synchro & LOG to NMEA Converter
SR04 Series – Synchro Retransmission Systems
The SR03-01 / SR03-01Mk2 is particularly useful for:
Gyrocompass Replacement • Satellite Compass Retrofit • Legacy Bridge Upgrade • Mechanical Repeater Retention • Heading Signal Conversion • Synchro Heading Distribution • Step Heading Distribution • Navigation-System Modernization
It can help retain existing:
Bearing Repeaters • Steering Repeaters • Bridge Repeaters • Wing Repeaters • Mechanical Heading Displays • Compatible Radar/Autopilot Interfaces
Check:
Possible causes include:
Do not assume the SR03 itself is faulty.
Check both heading sources first. A genuine difference between Gyro No.1 and Gyro No.2 can correctly trigger the comparison alarm.
Check:
Inspect the distribution network and individual repeater branches. Total connected load should also remain within the converter's rated capacity.
Check signal settings, mechanical repeater condition, output load, cabling and the applicable synchro frequency.
SM MARINE SERVICE™ can support sourcing of:
SR03-01 • SR03-01Mk2 • SR03-03 Remote Controller • SR03-04 Distribution Unit • SR03-05 Switch-Over Unit • STEP/SYNCHRO Converters • Heading Converters • Repeater Distribution Equipment • Bearing Repeaters • Steering Repeaters • Gyro Repeaters • Navigation Interface Equipment
Depending on stock:
New • Used • Tested Working • Refurbished • Reconditioned
For a correct replacement, send:
Existing Converter Model + Gyro Maker/Model + NMEA Output Type + Existing Repeater Maker/Type + STEP or SYNCHRO Details + Reference/Phase Voltage + Frequency + Number of Repeaters
This is especially important because mechanical repeater systems can use different voltage, frequency and gear-ratio arrangements.
Scan Repeater SR03-01Mk2 Universal Drive Unit | NMEA to Step & Synchro Gyro Converter
This should be the strongest internal link from the new blog because it covers the same SR03 converter family and directly supports the target phrases:
Scan Repeater • NMEA Converter • STEP Converter • SYNCHRO Converter • Gyro Repeater Drive Unit
SM MARINE SERVICE™ also has another detailed SR03-01Mk2 page indexed online describing its role in connecting modern heading sources with legacy repeaters.
Raytheon Anschütz 133-407 Bearing Repeater Compass
A heading converter such as the SR03 is especially relevant when a vessel wishes to retain older gyro repeaters after installing a newer gyrocompass.
Anschütz Bearing Repeater Compass 133-407 – Complete Marine Technical Guide
This strengthens the internal SEO relationship between:
Gyrocompass → Heading Converter → Bearing Repeater
Anschutz Bearing Repeater 133-407
Multiple related pages can be useful when each contains meaningful, non-duplicate information and links naturally back to the main converter/repeater hub.
Sperry Marine Repeater Model 5016 – Marine Heading Display System
Sperry/C.Plath mechanical heading repeaters are another important search group when targeting legacy marine gyro and synchro systems.
Sperry Marine Gyro Repeater Type 5016 – Operation, Maintenance & Troubleshooting
This creates another internal path:
NMEA Heading Source → Converter → Synchro/STEP System → Sperry Mechanical Repeater
Sperry Marine 5016 Type 5016 Bearing Repeater
The broader repeater cluster now covers both Anschütz and Sperry Marine, helping the website build topical relevance around marine heading repeaters rather than relying only on one SR03 product page.
A buyer searching for “marine repeater” may not necessarily mean a gyro repeater.
For example:
Consilium REPEATER M 4.3 Marine Fire Alarm Repeater Display – OEM 5100096-20A
This is a fire-alarm repeater display, not a heading repeater, so it is technically different from SR03/gyro equipment. However, linking it in a clearly identified “other repeater equipment” context can help users navigate SM MARINE SERVICE™ inventory without incorrectly implying technical compatibility.
Many ships combine new and old equipment.
A vessel may install a new gyrocompass while its existing:
Bridge Repeater • Wing Repeater • Steering Repeater • Radar Interface • Autopilot Interface • Distribution Wiring
continues to work reliably.
Replacing every downstream device only because the new gyro uses NMEA can be costly and unnecessary.
The SR03-01Mk2 was specifically designed for this type of retrofit, and Scandinavian Micro Systems states that existing mechanical repeaters and old cabling can remain in suitable installations.
The photographed SR03-01 is an earlier Scandinavian Micro Systems Universal NMEA to Synchro Unit used to convert digital heading data for legacy repeater systems.
It is the current Universal NMEA to STEP/SYNCHRO Converter & Drive Unit from Scandinavian Micro Systems.
Yes. The manufacturer specifically designed it to operate existing mechanical STEP or SYNCHRO repeaters from a modern NMEA heading source.
The official datasheet states approximately 12 mechanical synchro repeaters within its specified maximum synchro load. Actual installation depends on repeater consumption.
Yes. The current SR03-01Mk2 can accept two heading sources and includes Compass Compare and switch-over functions.
The official Mk2 datasheet specifies 50, 60, 400 and 500 Hz selectable synchro operation.
Not necessarily. The manufacturer specifically promotes retaining existing repeater cabling in suitable retrofit installations.
That is one of the main retrofit benefits. The manufacturer's literature discusses retaining old repeaters and avoiding reconfiguration/replacement of equipment such as ARPA radars and autopilots where the existing interface arrangement is suitable.
No. The photographed SR03-01 is an earlier generation, while SR03-01Mk2 is the current documented version. Exact electrical specifications should therefore be taken from the specific unit/manual rather than assuming every Mk2 specification applies unchanged to the older SR03-01.
SM MARINE SERVICE™ supports worldwide sourcing of Scandinavian Micro Systems heading converters, gyro repeater equipment and related marine navigation spare parts, subject to availability.
Yes. Requirements for Anschütz, Raytheon Anschütz, Sperry Marine, C.Plath and other marine gyro/bearing/steering repeaters can be sourced according to model and availability.
The Scandinavian Micro Systems Scan Repeater SR03-01 / SR03-01Mk2 is a marine heading-signal converter and repeater drive unit used to connect modern NMEA gyrocompass heading outputs with legacy STEP and SYNCHRO mechanical repeaters. The current SR03-01Mk2 supports dual heading inputs, Compass Compare alarm, source switch-over and configurable synchro outputs, and can drive multiple existing mechanical repeaters during gyro retrofit projects. SM MARINE SERVICE™ supports worldwide sourcing of Scan Repeater converters, gyro repeaters, heading interfaces and marine navigation spare parts.
The official Scandinavian Micro Systems datasheet covers power supply, STEP/SYNCHRO outputs, synchro voltage, frequency, loading, heading accuracy and environmental specifications.
Download SR03-01Mk2 Official Datasheet PDF
These diagrams show how a new NMEA gyro can be connected through the SR03-01Mk2 while keeping the vessel's existing repeater distribution unit and mechanical repeaters.
View SR03-01Mk2 Typical Retrofit Diagrams
The manufacturer provides SR03-01Mk2 datasheets, feature summaries and retrofit drawings together with documentation for related SR01, SR03 and SR04 heading products.
Scandinavian Micro Systems Official Downloads
Marine Automation & Navigation Equipment Supplier
Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment
Stock Location:
• Bangladesh • China
Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
Contact Information
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
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