Speed Log
medium
SOLAS-mandatory speed and distance measuring equipment. Doppler log for through-water and over-ground speed. EM log for through-water only.
Known Models (10)
Consilium SAL R30
Doppler
· Navigation Data / Sensor
technology: Doppler
imo_approved: True
Common Failures:
- • Transducer window replacement at drydock
- • Complex calibration procedure
- • Power supply sensitivity
Service: Premium Doppler log. Popular on Scandinavian-built vessels.
Spares: Consilium: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Consilium SAL T30
EM Log
· Navigation Data / Sensor
technology: Electromagnetic
imo_approved: True
Common Failures:
- • Sensor rod biofouling
- • Calibration drift
- • Retractable mechanism seal
Service: Basic EM log. Good for SOLAS compliance at low cost.
Spares: Consilium: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
JRC JLN-740A
Doppler / dual-axis
· Navigation Data / Sensor
technology: Doppler
bottom_track_depth: 400 m
imo_approved: True
Common Failures:
- • Transducer cavitation damage at high speed
- • Bottom lock loss in deep water
- • Display processor failure
Service: Good deep-water performance. Annual transducer inspection.
Spares: JRC: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
JRC JLN-205
EM Log
· Navigation Data / Sensor
technology: Electromagnetic
imo_approved: True
Common Failures:
- • Sensor rod fouling
- • Retractable rod seal leaks
- • Calibration drift
Service: Basic EM log. Sensor rod must be retracted for drydock. Annual calibration.
Spares: JRC: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Kongsberg EM Speed Log
EM Log
· Navigation Data / Sensor
technology: Electromagnetic
imo_approved: True
Common Failures:
- • Sensor probe biofouling
- • Calibration shift with hull fouling
- • Interface issues
Service: Integrated with K-Bridge. Standalone operation possible.
Spares: Kongsberg: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Raytheon Anschütz NautoPilot Speed
EM/Doppler
· Navigation Data / Sensor
technology: EM/Doppler
Common Failures:
- • Tight integration with autopilot — standalone issues
- • Calibration procedure tied to autopilot
- • Sensor aging
Service: Part of Raytheon Anschütz autopilot suite. Speed input for steering.
Spares: Raytheon Anschütz: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
SAM Electronics EM Log SAM
EM Log
· Navigation Data / Sensor
technology: Electromagnetic
Common Failures:
- • Legacy hardware
- • Wärtsilä transition support
- • Calibration data loss
Service: SAM Electronics brand. Wärtsilä provides ongoing support.
Spares: SAM Electronics: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Skipper DL850 Doppler Log
Doppler
· Navigation Data / Sensor
technology: Doppler
imo_approved: True
Common Failures:
- • Limited service network outside Scandinavia
- • Transducer compatibility
- • Display issues
Service: Norwegian manufacturer. Good in cold-water operations.
Spares: Skipper: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Sperry Marine SRD-500
Doppler / dual-axis
· Navigation Data / Sensor
technology: Doppler
imo_approved: True
Common Failures:
- • Integration dependency on VisionMaster
- • Transducer gate valve issues
- • Calibration complexity
Service: Designed for Sperry Marine bridges. Full standalone capability.
Spares: Sperry Marine: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Tokimec TL-250
EM Log
· Navigation Data / Sensor
technology: Electromagnetic
imo_approved: True
Common Failures:
- • Legacy brand confusion
- • Spare parts availability
- • Sensor rod aging
Service: Tokimec brand now Tokyo Keiki. Still in service on many vessels.
Spares: Tokimec: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.