Speed Log
medium
10 models total
SOLAS-mandatory speed and distance measuring equipment. Doppler log for through-water and over-ground speed. EM log for through-water only.
8 manufacturers · 10 models
Consilium
2
SAL R30
Doppler
· Navigation Data / Sensor
Technology
Doppler
IMO Approved
ja
Common Failures & Inspection Points
- Transducer window replacement at drydock
- Complex calibration procedure
- Power supply sensitivity
Service: Premium Doppler log. Popular on Scandinavian-built vessels.
Spare Parts: Consilium: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
SAL T30
EM Log
· Navigation Data / Sensor
Technology
Electromagnetic
IMO Approved
ja
Common Failures & Inspection Points
- Sensor rod biofouling
- Calibration drift
- Retractable mechanism seal
Service: Basic EM log. Good for SOLAS compliance at low cost.
Spare Parts: Consilium: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
JRC
2
JLN-740A
Doppler / dual-axis
· Navigation Data / Sensor
Technology
Doppler
Bottom track depth
400 m
IMO Approved
ja
Common Failures & Inspection Points
- Transducer cavitation damage at high speed
- Bottom lock loss in deep water
- Display processor failure
Service: Good deep-water performance. Annual transducer inspection.
Spare Parts: JRC: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
JLN-205
EM Log
· Navigation Data / Sensor
Technology
Electromagnetic
IMO Approved
ja
Common Failures & Inspection Points
- Sensor rod fouling
- Retractable rod seal leaks
- Calibration drift
Service: Basic EM log. Sensor rod must be retracted for drydock. Annual calibration.
Spare Parts: JRC: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Kongsberg
1
EM Speed Log
EM Log
· Navigation Data / Sensor
Technology
Electromagnetic
IMO Approved
ja
Common Failures & Inspection Points
- Sensor probe biofouling
- Calibration shift with hull fouling
- Interface issues
Service: Integrated with K-Bridge. Standalone operation possible.
Spare Parts: Kongsberg: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Raytheon Anschütz
1
NautoPilot Speed
EM/Doppler
· Navigation Data / Sensor
Technology
EM/Doppler
Common Failures & Inspection Points
- Tight integration with autopilot — standalone issues
- Calibration procedure tied to autopilot
- Sensor aging
Service: Part of Raytheon Anschütz autopilot suite. Speed input for steering.
Spare Parts: Raytheon Anschütz: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
SAM Electronics
1
EM Log SAM
EM Log
· Navigation Data / Sensor
Technology
Electromagnetic
Common Failures & Inspection Points
- Legacy hardware
- Wärtsilä transition support
- Calibration data loss
Service: SAM Electronics brand. Wärtsilä provides ongoing support.
Spare Parts: SAM Electronics: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Skipper
1
DL850 Doppler Log
Doppler
· Navigation Data / Sensor
Technology
Doppler
IMO Approved
ja
Common Failures & Inspection Points
- Limited service network outside Scandinavia
- Transducer compatibility
- Display issues
Service: Norwegian manufacturer. Good in cold-water operations.
Spare Parts: Skipper: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Sperry Marine
1
SRD-500
Doppler / dual-axis
· Navigation Data / Sensor
Technology
Doppler
IMO Approved
ja
Common Failures & Inspection Points
- Integration dependency on VisionMaster
- Transducer gate valve issues
- Calibration complexity
Service: Designed for Sperry Marine bridges. Full standalone capability.
Spare Parts: Sperry Marine: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Tokimec
1
TL-250
EM Log
· Navigation Data / Sensor
Technology
Electromagnetic
IMO Approved
ja
Common Failures & Inspection Points
- Legacy brand confusion
- Spare parts availability
- Sensor rod aging
Service: Tokimec brand now Tokyo Keiki. Still in service on many vessels.
Spare Parts: Tokimec: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.