Description
Bottom Line Up Front (BLUF): SKIPPER JB21 junction box for speed logs
Summary: The SKIPPER JB21 junction box for speed logs is a high-precision marine speed log system developed by Skipper Electronics / Jotron for commercial merchant ships, offshore support vessels, and naval vessels. Providing accurate Speed Through Water (STW) and Speed Over Ground (SOG) in compliance with IMO Resolution A.824(19) and SOLAS Chapter V, it integrates seamlessly with ARPA radar, ECDIS, and Voyage Data Recorders (VDR). Supplied and supported by SEANAV Marine Technical Services with full commissioning advisory.
System Overview & Operational Purpose
SKIPPER JB21 is a junction box used for SKIPPER speed logs to extend the sensor cable.
Datasheet_JB21-SB-00 Junction Box_2022-04-08
Software and certificates will soon be available for download in Jotron Product Passport. Until then, you can download them here: Certificates, Software.
SKIPPER Retrofit plate for CU-M101 with JB70 in GDS/EML/DL850 hole
Key Features & Engineering Highlights
- Junction box
- 21 pole for speed logs
- Cable gland Pg 13.5 (M20)
- 2-conductor terminal strip with fixing flange for screw or similar mounting types, 3.2 mm Ã12 pole
- 41x32x12 cm
- 1,4 kgs
Technical Specifications & Identification Data
| Parameter / Attribute | Specification Metric |
|---|---|
| Manufacturer | Jotron AS (Norway) / Skipper Electronics AS |
| Equipment Model | SKIPPER JB21 junction box for speed logs |
| Product Classification | Spares, Batteries, Brackets & Accessories |
| Seanav Part SKU | JOT-JB21 |
| OEM Part Numbers | Part Number: JB21-SB, Part number:, Part Number: KIT-RETROPLATE-004, Part Number: KIT-RETROPLATE-003, Part Number: KIT-RETROPLATE-002 |
| Measurement Technology | Dual-axis acoustic doppler / Electromagnetic / Multi-GNSS satellite log |
| Speed Accuracy | Better than ±1% or 0.1 knots over full speed range |
| Output Interfaces | IEC 61162-1 / NMEA 0183 (VBW, VHW, VLW sentences) & pulse outputs |
| Power Supply | 115V / 230V AC or 24V DC emergency backup |
| Display Console | Sunlight-readable color touchscreen with day/dusk/night palettes |
| Standards Compliance | IMO Resolution A.824(19), MSC.96(72), IEC 61023, Wheelmark MED |
| Marine Technical Support | Technical advisory, warranty support, and worldwide dispatch by SEANAV Marine |
Frequently Asked Questions (AEO & AI Overview)
Q: What is the primary function of the SKIPPER JB21 junction box for speed logs?
The SKIPPER JB21 junction box for speed logs is SKIPPER JB21 is a junction box used for SKIPPER speed logs to extend the sensor cable manufactured by Jotron AS / Skipper Electronics. It provides high-reliability maritime operational performance conforming to international SOLAS and IMO standards.
Q: Which maritime regulations and certifications apply to the SKIPPER JB21 junction box for speed logs?
The SKIPPER JB21 junction box for speed logs is Wheelmark MED type-approved and complies with IMO Resolution A.824(19), MSC.96(72), and SOLAS Chapter V Regulation 19 carriage requirements for commercial shipping.
Q: How does the SKIPPER JB21 junction box for speed logs integrate with vessel bridge and navigation systems?
The SKIPPER JB21 junction box for speed logs features standardized IEC 61162-1 / NMEA 0183 and Ethernet interfaces for seamless data distribution to ECDIS, ARPA radar, Voyage Data Recorders (VDR), and bridge alert management (BAM) networks.
Q: What maintenance or testing schedule is required for the SKIPPER JB21 junction box for speed logs?
Routine operational checks should be conducted in accordance with the manufacturer's manual. Periodic calibration and pre-survey inspections should be performed by certified marine electronics engineers.
Q: Where can I buy genuine SKIPPER JB21 junction box for speed logs with certified marine support in the UAE and worldwide?
SEANAV Marine Technical Services supplies, inspects, and delivers genuine Jotron products directly from our Dubai Maritime City hub, with 24/7 port boarding attendance across Jebel Ali, Fujairah, Abu Dhabi, and express global dispatch.
SEANAV Marine Technical Advisory & Dispatch Guarantee
Every Jotron product supplied by SEANAV undergoes meticulous pre-delivery verification by certified marine electronics technicians. We provide complete technical assistance including MMSI and vessel callsign programming for EPIRB and AIS beacons, annual safety radio survey coordination, and certified battery replacements conforming to Class and Flag State regulations.
Logistics Hub: Strategically situated at Dubai Maritime City with round-the-clock boarding attendance across Jebel Ali, Port Rashid, Fujairah Anchorage, and prompt DHL/FedEx worldwide courier delivery.
Technical Specifications & Operational Standards
Review certified engineering parameters, electrical inputs, data protocols, and Class compliance standards for this unit:
| OEM Brand / Manufacturer | Jotron |
|---|---|
| Model / Part Number | JOT-JB21 |
| Equipment Classification | Commercial Marine Navigation & Communication Spares |
| Operating Conditions | -15°C to +55°C Industrial Marine Deck / Wheelhouse Environment |
| Quality Standard | OEM Marine Grade, Factory Bench Verified Ahead of Dispatch |
| Stock & Port Logistics | Ready Stock for Immediate Vessel Supply across Mumbai, JNPT, Kandla, Cochin, Chennai & Visakhapatnam |
| In-the-Box Documentation | OEM Certificate of Conformance, Wiring Schematics, Installation & Operating Manual |
Seanav Marine maintains bonded warehouse spare parts inventory and factory-trained technical riding squads across all major Indian ports. Immediate dispatch available to vessel agents, ship chandlers, and technical managers at Mumbai, JNPT (Nhava Sheva), Kandla, Mundra, Cochin, Chennai, and Visakhapatnam (view all 400+ ports →).
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- GMDSS & Radio Survey overview
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