SRT GMDSS Radio Survey | Bureau Veritas – BV | UAE
Direct-Answer Authority Briefing • SOLAS Ch. IV / V • Class Approved • 24/7 Port Dispatch
Statutory Engineering Directive: Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection
Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection statutory marine engineering inspection, diagnostic calibration, precision gyrosphere/magnetron overhaul, annual radio survey, and Class certification by Seanav Marine ensure complete adherence to SOLAS Ch. IV, Bureau Veritas Marine Rules NR467, IMO Res. A.1104(29), IACS UR Z17 and classification society rules across international merchant shipping fleets. Operating under strict compliance with SOLAS Chapter IV / V, IMO Resolutions, ITU Radio Regulations, and IACS Unified Requirements (E10, E22, Z17), this mission-critical bridge navigational installation provides uncompromising maritime collision avoidance, true north heading reference (±0.1° secant latitude accuracy), voyage data event recording, distress and safety radiocommunications, and fail-safe bridge alert management across container carriers, oil tankers, chemical parcel carriers, gas carriers (LNG/LPG), dry bulkers, and offshore support vessels. Statutory survey protocol mandates thorough physical examination, radio frequency (RF) power and spectrum analysis, supporting fluid specific gravity verification, acoustic underwater beacon 30-day battery capacity testing, fail-safe alarm interlock checks (<2 seconds trigger response), and official witnessing by authorized classification society surveyors (DNV, ABS, Lloyd’s Register, ClassNK, Bureau Veritas, RINA, IRS). Certified technical service coverage spans 24/7 port dispatch across key bunkering, cargo, and shipyard hubs including Dubai, Fujairah, Singapore, Rotterdam, Antwerp, Houston, and Mumbai, maintaining comprehensive genuine OEM spare parts inventory for Furuno, JRC, Sailor (Thrane & Thrane), Raytheon Anschütz, YDK Technologies (Yokogawa established in 1852 formerly Yokogawa Denshikiki).
1. System Architecture & Marine Operating Principles
Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection serves as an indispensable pillar of modern merchant vessel bridge navigation and maritime safety operations. Operating in punishing maritime environments subject to severe thermal fluctuations, mechanical vibrations, high humidity, and corrosive salt air, shipboard navigation aids and radio communication installations must maintain uncompromising operational accuracy and reliability.
Modern commercial vessels—spanning container ships, crude oil tankers, chemical parcel carriers, gas carriers (LNG/LPG), dry bulkers, and offshore vessels—rely on an integrated bridge navigational ecosystem. The core operational architecture comprises: Bureau Veritas (BV) Recognized Service Supplier, Complete Sea Area A1+A2+A3+A4 GMDSS Architecture. Each component is engineered to provide fail-safe performance, precise heading and positioning data, real-time collision warning telemetry, and uninterrupted emergency distress alerting in full compliance with international maritime safety conventions.
Seanav Marine deploys certified marine electronics engineers, licensed compass adjusters, and Class-approved radio inspectors to provide 24/7 attendance across international ports and anchorages. Whether executing urgent radar magnetron replacements, factory gyrocompass overhauls, VDR annual performance testing, or statutory GMDSS surveys, our flying squads ensure rapid turnaround while eliminating the risk of Port State Control (PSC) detentions.
2. Governing Maritime Regulations & Classification Standards
Shipboard navigation aids, gyrocompasses, voyage data recorders, and radio communication systems are governed by strict international standards enforced by the International Maritime Organization (IMO) and classification societies under IACS. Merchant shipping compliance mandates adherence to:
- SOLAS Chapter V (Safety of Navigation, Regulations 19 & 20): Mandates carriage requirements, operational performance standards, and annual testing protocols for gyrocompasses, marine radars, automatic identification systems (AIS), and voyage data recorders (VDR/S-VDR).
- SOLAS Chapter IV (Radiocommunications): Establishes global standards for GMDSS installations across Sea Areas A1, A2, A3, and A4, requiring annual radio surveys and continuous distress listening watches.
- IMO Performance Standards & IEC Specifications: Defines international benchmarks including IMO Res. A.424(XI) (Gyrocompasses), MSC.192(79) (Radar), MSC.333(90) (VDR), MSC.302(87) (BAM), and IEC 60945 (General Requirements for Marine Navigation Equipment).
- IACS Unified Requirements (UR E10, E22, Z17): Governs environmental testing, computer-based systems, and procedural requirements for approved service suppliers executing statutory surveys.
- Classification Society Approvals: Full compliance verified and certified by DNV, American Bureau of Shipping (ABS), Lloyd’s Register (LR), Bureau Veritas (BV), ClassNK, RINA, and Indian Register of Shipping (IRS).
3. Technical Specifications & Operational Thresholds
The following engineering benchmarks define the baseline parameters, testing thresholds, electrical envelopes, and accuracy tolerances for Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection:
| Specification Parameter | Nominal Engineering Range / Threshold | Statutory Standard / Classification Rule |
|---|---|---|
| Governing International Convention & Rules | SOLAS Ch. IV, Bureau Veritas Marine Rules NR467, IMO Res. A.1104(29), IACS UR Z17 / SOLAS Ch. IV & V | IMO / IACS Unified Requirements (E10, E22, Z17) |
| Electrical Supply & Voltage Envelope | Dual redundant 24V DC (18–32V DC) feeds / 115–230V AC 50/60 Hz; emergency reserve battery 4-hour to 6-hour endurance | IEC 60092-504 / IEC 60945 / IEC 61097 |
| Operational Accuracy & Tolerance Limits | Heading settling accuracy ±0.1° sec lat; Gyro settling time <3 hours; GPS position accuracy <2.5m CEP; Radar frequency 9.4 GHz / 3.0 GHz | ISO 8728 / IEC 62388 / IEC 61108-1 |
| Enclosure Ingress & Environmental Withstand | IP22 (wheelhouse console) to IP56/IP67 (scanner pedestal, binnacle, external capsule); operating temp -25°C to +55°C | IEC 60529 / IEC 60945 Marine Environment |
| Dynamic Data Interfaces & Telemetry | IEC 61162-1/2 (NMEA 0183 high speed 38,400 bps), IEC 61162-450 (Lightweight Ethernet), contact closures, serial isolated RS-422 | IEC 61162-1 / IEC 61162-450 / BAM MSC.302(87) |
| Statutory Periodic Survey & Expiry Lifespan | Annual statutory radio survey; Annual VDR APT; Gyrosphere 24 to 36 month overhaul; Acoustic beacon 3-year battery renewal | SOLAS Ch. V Reg. 20 / SOLAS Ch. IV Reg. 16 |
| Statutory Classification Society Endorsement | Type-approved and certified by DNV, ABS, Lloyd’s Register (LR), Bureau Veritas (BV), ClassNK, RINA, and IRS for worldwide merchant shipping | SOLAS Ch. IV, Bureau Veritas Marine Rules NR467, IMO Res. A.1104(29), IACS UR Z17 |
4. Failure Modes, Diagnostic Symptoms & Root Cause Troubleshooting
Marine bridge electronics and sensor assemblies operate under continuous duty cycles and thermal stresses. The following 5-column diagnostic matrix details critical failure modes encountered on Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection, their underlying mechanisms, affected sub-assemblies, observable symptoms, and precision remediation workflows:
| Failure Mode & Diagnostic Indicator | Root Cause Mechanism | Affected Sub-System | Observable Symptom & Metric | Certified Remediation Procedure |
|---|---|---|---|---|
| Gyrocompass Settling Drift or High Heading Error (>1.5 Degrees) | Supporting fluid specific gravity degradation, gyrosphere rotor bearing mechanical wear, or azimuth follow-up servo motor optical encoder drift | Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection / Master Gyro Compass Binnacle | Heading display wandering, off-course alarm triggering, or radar North-Up presentation misalignment | Perform binnacle drain and chemical flush; install new factory-calibrated gyrosphere; renew supporting liquid and centering O-rings; realign optical encoder; verify settling within 3 hours |
| Marine Radar Target Blind Spots or Low Transceiver Output | Magnetron cathode emission depletion (>4,000 hours service), defective receiver front-end diode limiter, or circulator microwave leakage | Marine X-Band / S-Band Radar Pedestal & Transceiver Unit | Radar performance monitor arc attenuation (<3 rings), inability to detect standard navigational buoys beyond 3 nautical miles | Measure magnetron anode current; replace worn magnetron with certified OEM unit; calibrate diode limiter; tune local oscillator Gunn diode; verify performance monitor response |
| VDR / S-VDR Annual Performance Test (APT) Recording Failure | Corrupted radar frame grabber card, expired acoustic underwater beacon battery, or degraded backup lead-acid accumulator pack | Voyage Data Recorder Data Acquisition Unit & Capsule | Warning lamp flashing on VDR remote alarm unit, missing bridge audio tracks or radar image streams during statutory 12-hour download | Download and audit raw 12-hour test data; calibrate bridge microphone sensitivity; test float-free / fixed capsule release; renew beacon battery; issue Class APT survey report |
| GMDSS MF/HF Transceiver Antenna Tuning Lockout or High VSWR | Corroded outdoor antenna tuning unit (ATU) copper earth strap, cracked ceramic lead-in insulator, or high standing wave ratio (>2.5:1) | GMDSS Console / MF/HF 150W-500W Radio & Whip Antenna | Transmitter power foldback to <20W, ATU hunting sound, failure to establish test link on 2187.5 kHz DSC distress channel | Dismantle ATU enclosure; clean internal ceramic spark gap; burnish ground connection to steel deck; renew coaxial feed cable; re-test DSC call with coast station |
| GPS Week Number Rollover (WNRO) False Date / Time Corruption | Internal GPS receiver 10-bit epoch counter overflow (1024 weeks), transmitting corrupted 19–20 year retrograde NMEA ZDA sentences | Bridge Marine GPS / DGPS Receiver & Antenna Unit | ECDIS and AIS displaying inaccurate UTC dates, triggering synchronization faults on VDR and GMDSS consoles | Connect service console; re-flash receiver firmware to latest factory epoch patch; verify NMEA 0183 output sentences; synchronize bridge navigation repeaters |
5. 12-Step Certified Marine Engineering Workflow
Seanav Marine executes statutory inspection, diagnostic troubleshooting, component overhaul, and Class survey certification for Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection through an exhaustive 12-step protocol organized across four distinct operational phases:
Phase 1: Pre-Survey Safety Isolation, Lockout/Tagout (LOTO) & Cold Baseline Verification
Step 1: Pre-Survey Service Coordination, Defect Log Review & Manifest Analysis
Prior to boarding, Seanav certified marine electronics engineers review the vessel Chief Engineer’s defect reports, VDR fault logs, gyrocompass operational hours, and classification society survey requirements for Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection. Engineering work packs, calibrated microwave/RF test gear, and genuine OEM replacement parts are pre-staged for immediate on-site mobilization.
Step 2: Permit-to-Work, Lockout/Tagout (LOTO) & Bridge Coordination
Attending engineers execute formal risk assessments in accordance with IMO, SOLAS, and ship safety management systems (SMS). Electrical lockout/tagout (LOTO) procedures are established across 440V/220V power feeds, scanner antenna motor rotation isolators, and high-voltage radar magnetron capacitors before physical intervention.
Step 3: Baseline Diagnostics & Electronic Telemetry Extraction
Engineers capture baseline operational telemetry across Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection: extracting internal software event logs, checking power supply rail voltages (5V, 12V, 24V DC), measuring RF forward/reflected power on radio transmitters, and verifying serial NMEA 0183 and Ethernet IEC 61162 data bus communication rates.
Phase 2: High-Precision Secondary/Primary Injection, Optical Diagnostics & Sensor Calibration
Step 4: Mechanical Teardown, Binnacle Cleaning & Component Inspection
Sub-assemblies are meticulously dismantled using specialized marine pullers and non-magnetic tools. Binnacle liquid reservoirs, magnetron mounting cavities, radar gearbox gear trains, and VDR junction terminals are inspected for mechanical wear, salt aerosol corrosion, or fluid contamination.
Step 5: Sensitive Element / Magnetron / Battery Renewal & Ultrasonic Servicing
Engineers install certified genuine components: exchanging gyrospheres, replacing high-power magnetrons, renewing acoustic underwater beacon battery cells, replacing GMDSS reserve battery sets, or ultrasonic cleaning optical encoder disks in specialized cleaning baths.
Step 6: Fluid Renewal, Gasket Replacement & Precision Mechanical Alignment
Gyrocompass binnacles are refilled with fresh, certified supporting fluid and distilled water mix carefully balanced to OEM specific gravity tolerances. High-temperature silicone O-rings, radar scanner waveguide gaskets, and IP67 weather deck seals are renewed and torqued to manufacturer specifications.
Phase 3: Dynamic Operating Functional Testing, Interlock Tripping & Blackout Simulation
Step 7: High-Precision Secondary Signal Injection, RF Calibration & Optical Tuning
Using precision test instruments (Marconi/Aeroflex RF power meters, Fluke multi-calibrators, radar spectrum analyzers, and optical lux meters), engineers calibrate signal levels, receiver sensitivity, transmitter modulation, and azimuth pick-up coil null voltages within certified marine tolerances.
Step 8: Rapid Settling Verification, Heading Synchronization & Repeater Alignment
The overhauled gyrocompass or navigation system is energized in fast-settling mode. Engineers monitor settling dampening curves, verify true north settling within strictly <3 hours, and synchronize all bridge steering repeaters, bearing repeaters, radar North-Up inputs, ECDIS overlays, and autopilot interfaces.
Step 9: Simulated Emergency Alarm, Distress Alert & Safety Interlock Testing
Engineers simulate statutory emergency fault triggers on Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection: testing heading failure alarms, off-course alarms, radar scanner safety interlock switches, VDR power failure changeovers, and DSC distress alert transmission loops, verifying fail-safe acoustic and visual alarms trigger in <2 seconds.
Phase 4: Class Surveyor Witnessing, Sea Trials Endorsement & Statutory Handover
Step 10: Dynamic Operating Load Trials & Full Sea-Going Simulation
Under active sea trial or vessel maneuvering conditions, Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection is demonstrated under full operational loads. Engineers monitor heading stability under rapid rudder cycling, verify radar target tracking (ARPA/TT) across multi-mile ranges, audit VDR multi-channel audio clarity, and confirm radio transmission range.
Step 11: Classification Society Surveyor Witnessing & Statutory Endorsement
When statutory certification is required, Seanav lead marine electronics engineers coordinate directly with the attending Classification Society surveyor (DNV, ABS, Lloyd’s Register, ClassNK, BV, RINA, IRS). Engineers demonstrate live system performance, present calibrated test records, and obtain official Class survey endorsement.
Step 12: Comprehensive Marine Engineering Service Dossier Handover
An exhaustive engineering service dossier is compiled on-site, including before-and-after RF power levels, gyrosphere serial numbers, magnetron hours, VDR data verification certificates, and Class test sheets. The Chief Engineer and Master countersign the report for shipboard records and flag state audits.
6. Planned Maintenance System (PMS) & Calibration Protocols
To preserve statutory classification approvals and ensure flawless navigational safety between dry-dock cycles, vessel operators must incorporate standardized Planned Maintenance System (PMS) tasks into shipboard management software (AMOS, TM Master, Danaos, StarIPS). Seanav Marine prescribes the following maintenance intervals for Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection:
| Maintenance Frequency | Mandatory Engineering Tasks & Quality Control Checks |
|---|---|
| Daily / Navigational Watch | Verify master gyrocompass heading against magnetic compass and GPS satellite compass; check radar performance monitor arc; verify VDR remote status indicator lamp; inspect GMDSS battery charger float voltage (27.2–27.6V DC). |
| Weekly Maintenance | Perform internal automated self-test on VHF DSC transceivers; test bridge alert management (BAM) audible sounders; inspect radar scanner pedestal for unusual mechanical noise or vibration; verify ECDIS chart update status. |
| Monthly Maintenance | Conduct off-air DSC test calls on MF/HF 2187.5 kHz; check gyrosphere operating current and supporting fluid level/temperature; inspect VDR float-free capsule hydrostatic release mechanism and expiry dates; clean magnetic compass binnacle optics. |
| Semi-Annual Maintenance | Check radar antenna motor carbon brushes and slip rings; inspect antenna feedlines and ATU grounding copper braids; perform controlled battery discharge test on GMDSS reserve bank; measure radar magnetron oscillation current. |
| Annual Class Survey Overhaul | Full statutory GMDSS radio survey witnessed by Class; annual VDR Annual Performance Test (APT) with certificate issuance; magnetic compass deviation swing and deviation card update; gyrocompass overhaul and fluid renewal; Class surveyor endorsement. |
7. Dry-Docking & 5-Year Special Periodical Survey (SPS) Overhaul Protocols
During mandatory five-year Special Periodical Survey (SPS) shipyard dockings, Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection undergoes comprehensive physical dismantling, non-destructive testing, workshop recalibration, and Class re-certification. Seanav Marine deploys certified flying squads to execute the following shipyard overhaul protocols:
- Complete shipyard dry-dock marine electronics overhaul for Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection: Comprehensive bench testing, physical isolation, and clean workshop servicing during mandatory 5-year Special Periodical Surveys (SPS).
- Master gyrocompass complete teardown & gyrosphere replacement: Removal of binnacle to shore workshop, complete chemical flushing of bowl and cooling jacket, replacement of gyrosphere, renewal of centering contacts, and 72-hour dynamic drift testing.
- Marine radar scanner pedestal and gearbox rebuild: Dismantling of antenna turning unit, replacement of drive motor bearings, renewal of carbon brushes, replacement of high-power magnetron, circulator, and diode limiter, and re-torquing of masthead mounting bolts.
- VDR hardened capsule & float-free overhaul: Acoustic underwater locator beacon (ULB) battery replacement, hydrostatic release unit (HRU) renewal, cable harness replacement, and re-certification of data retention integrity.
- GMDSS antenna and cable array refit: Complete visual, mechanical, and megger insulation testing of coaxial feedlines, renewal of weather-deck antenna whip isolators, ultrasonic inspection of mast fittings, and RF spectrum analyzer tuning.
- Magnetic compass binnacle refurbishment: Workshop cleaning of compass bowl, bubble elimination, fluid replacement, sapphire jewel and iridium pivot inspection, and sea-trial deviation swing with certified compass adjuster.
- Official Class surveyor witnessing & sea trials: Dynamic sea trial validation of bridge navigation aids, heading stability under high-speed maneuvering, and final Class statutory certificate endorsement.
8. Global Service Hubs & Strategic Port Dispatch
Seanav Marine provides 24/7 attendance and Class-certified technical support across primary international maritime routes, major bunkering anchorages, container terminals, and shipyards. Our marine electronics specialists maintain strategic inventories of genuine OEM parts manufactured by Furuno, JRC, Sailor (Thrane & Thrane), Raytheon Anschütz, YDK Technologies (Yokogawa established in 1852 formerly Yokogawa Denshikiki):
Dubai Maritime City & Port Rashid (UAE)
Central Middle East headquarters equipped with advanced radar microwave labs, gyrocompass test binnacles, and certified Class radio surveyors for {oems}.
Fujairah Offshore Anchorage (UAE)
24/7 offshore launch boat dispatch for emergency gyrocompass repairs, radar magnetron replacements, and VDR APT testing during bunkering.
Singapore Jurong & Tuas Shipyards
Asia-Pacific technical center delivering flying squads, gyro overhauls, GMDSS annual surveys, and rapid attendance across all Singapore anchorages.
Rotterdam Botlek & Europoort (Netherlands)
European technical center supporting Northwest European fleets with Class-certified navigation, communication, and automation engineers.
Antwerp & Zeebrugge Ports (Belgium)
Dedicated Benelux field service engineering base for container vessels, chemical tankers, and LNG carriers calling at Antwerp and Zeebrugge.
Houston Ship Channel & Gulf Coast (USA)
Americas marine service branch providing USCG and Class-compliant radar, gyrocompass, and GMDSS maintenance across Galveston, New Orleans, and Corpus Christi.
Mumbai Port & JNPT Nhava Sheva (India)
Indian Subcontinent hub delivering specialized marine electronics overhauls, IRS/ABS/BV radio surveys, and Class survey preparation across Mumbai, Goa, and Gujarat ports.
9. Comprehensive Technical Maritime FAQs
The following technical inquiries represent the most critical operational and statutory questions submitted by shipowners, technical superintendents, and Chief Engineers regarding Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection:
Q1: What international marine regulations govern statutory inspection and maintenance of Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection?
Engineering Response: Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection is strictly governed by SOLAS Chapter IV (Radiocommunications), SOLAS Chapter V (Safety of Navigation, Regulations 19 and 20), IMO Performance Standards (Resolutions A.424(XI), MSC.192(79), MSC.333(90), MSC.302(87)), and IACS Unified Requirements (E10, E22, Z17). International classification societies (DNV, ABS, Lloyd’s Register, ClassNK, BV, RINA, IRS) require annual operational testing, annual VDR APT surveys, periodic gyrocompass overhauls, and statutory GMDSS radio surveys.
Q2: How frequently must a marine gyrocompass be overhauled and its gyrosphere replaced on Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection?
Engineering Response: Under manufacturer specifications and classification society guidelines, a marine gyrocompass supporting fluid and gasket kit should be inspected and renewed annually, while the sensitive element (gyrosphere) typically requires replacement every 24 to 36 months depending on continuous running hours (typically 20,000 to 25,000 hours). Seanav engineers execute complete binnacle servicing, fluid replacement, optical pick-up alignment, and rapid settling calibration during scheduled port stays.
Q3: What is entailed in an Annual Performance Test (APT) for a VDR or S-VDR on Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection?
Engineering Response: A statutory VDR Annual Performance Test (APT) mandates a comprehensive audit of all recorded voyage data streams per IEC 61996. A certified Seanav engineer inspects the hardened capsule and float-free release mechanism, tests the acoustic underwater locator beacon (verifying battery expiration), checks the 2-hour backup reserve battery endurance, downloads 12 hours of continuous historical data, validates radar video frames, ECDIS images, and audio microphone clarity, and submits an official APT certificate for Class endorsement.
Q4: Why is radar magnetron replacement necessary on Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection, and what symptoms indicate failure?
Engineering Response: A marine radar magnetron is a thermionic vacuum tube that generates high-power microwave pulses (typically 10 kW to 30 kW). Over continuous operation (typically 3,000 to 5,000 running hours), the cathode emission material slowly depletes, leading to diminished microwave power output, unstable frequency oscillation, and missing target echoes on long ranges. Typical symptoms include a degraded performance monitor circle (less than 3 rings), loss of small target detection, and high receiver noise.
Q5: Can Seanav Marine provide 24/7 emergency dispatch and genuine spare parts for Furuno, JRC, Sailor (Thrane & Thrane), Raytheon Anschütz, YDK Technologies (Yokogawa established in 1852 formerly Yokogawa Denshikiki) on Bureau Veritas (BV) Approved GMDSS Radio Survey & Navigational Safety Inspection?
Engineering Response: Yes. Seanav Marine maintains 24/7 rapid technician dispatch across major global maritime corridors including Dubai, Fujairah, Singapore, Rotterdam, Antwerp, Houston, and Mumbai. Our engineering vans and workshops stock certified genuine OEM replacement parts, gyrospheres, supporting liquids, radar magnetrons, circulators, VDR acoustic beacons, and GMDSS emergency batteries for Furuno, JRC, Sailor (Thrane & Thrane), Raytheon Anschütz, YDK Technologies (Yokogawa established in 1852 formerly Yokogawa Denshikiki).