SEMA Marine
Stéphane
Electronics Marine Azur
SEMA
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SEMA projects

Onboard projects,
from Saint-Tropez to Monaco

Starlink connectivity, bridge refits, lithium energy: every job is engineered as a system, cleanly wired and documented for the captain.

Discuss my project See the case studies
  • 23 yrsof marine electronics
  • 06 & 83French Riviera
  • 7/7in season

🔒 Confidentiality & Discretion — Out of respect for owners and crews, no vessel is photographed onboard: each project is presented through its onboard engineering diagram.

Before / After refit

From tangled wiring to a documented NMEA 2000 network

Drag the slider: on the left, the bridge as we often find it; on the right, the architecture SEMA delivers — one backbone, devices talking to each other, every cable traced.

Before · untraced NMEA 0183 wiringBefore · NMEA 0183
7" PLOTTERRADARSOUNDERLOGVHFAUTOPILOT4G BOX!!!NMEA 0183Untraced splices
After refit · single NMEA 2000 backboneAfter · NMEA 2000
ETHERNETNMEA 2000 BACKBONEGARMIN MFD 1GARMIN MFD 2STARLINKPEPLINK 5GDOPPLER RADARFLIRAUTOPILOTGPS / AISVICTRON
BUS ARCHITECTURE
1 Backbone
Unified NMEA 2000 network
INTERCONNECTION
9 Systems
Devices integrated on the vessel bus
ONBOARD TRACEABILITY
100 %
Labelled, tested & documented cabling
WAN CONTINUITY
5G ↔ SAT
Automatic Peplink / Starlink failover
Case studies

Four jobs, four architectures

Each study comes from a real SEMA job and is shown through its onboard engineering blueprint.

MFD 1MFD 2NMEA 2000Typical integration blueprint
1
Unified console
N2K
Single, documented backbone
Bespoke
Screens chosen with the owner

Helm consolePort Hercule · Monaco

Princess Complete helm station refit

Dashboard refit on a Princess: advice on screen selection, new layout and ergonomics rebuilt around the helmsman.

  • Large-format MFD
  • NMEA 2000
  • Garmin
  • Raymarine
Before
  • Scattered instruments, fragmented reading
  • Ageing screens, poor sunlight readability
  • Cabling piled up over the years
After
  • Unified dashboard around multifunction displays
  • Readability and ergonomics redesigned
  • Clean, labelled NMEA 2000 network
See the related service →
LiFePO4BMSVICTRONDC BUSNAVCOMACTypical integration blueprint
LiFePO4
Safe lithium chemistry
BMS
Cell-by-cell protection
On time
Worksite delivered on schedule

Energy & LithiumOld Port · Cannes

Electrical system Complete electrical system upgrade

A complex technical job: battery bank, charging, distribution and monitoring redesigned, worksite left spotless and on time.

  • Victron Energy
  • LiFePO4
  • BMS
  • Monitoring
Before
  • Battery bank at end of life
  • Mismatched chargers and distribution
  • No visibility on consumption
After
  • LiFePO4 bank supervised by a BMS
  • Consistent Victron charging and distribution
  • Onboard energy monitoring
See the related service →
MFDMFDRADARGPSAISAPNMEA 2000 BACKBONETypical integration blueprint
Doppler
New-generation radar
100 %
Cables tagged and labelled
Docs
Technical file handed over

Bridge refitMonaco Yacht Show

Garmin bridge Complete bridge refit

New Garmin MFDs, Doppler radar and electrical network overhaul: surgical work, structured and labelled cabling, technical documentation handed to the captain.

  • Garmin MFD
  • Doppler radar
  • NMEA 2000
  • Labelled cabling
Before
  • Previous-generation MFDs
  • Radar without Doppler processing
  • Tangled power and data networks
After
  • New networked Garmin MFDs
  • Doppler radar integrated into the bridge
  • Structured, labelled and documented cabling
See the related service →
In their words

Owners and captains speak

“Impeccable Starlink Maritime installation on our Sunseeker 82. Neat cabling, seamless integration into the existing network. Stéphane took the time to explain the system to the crew. Premium service, highly recommended.”
Client, Sunseeker 82Port Vauban, Antibes
“Complete electrical system upgrade on our vessel. A complex technical job carried out with great mastery. The worksite was left spotless and on time. A safe bet.”
Client, electrical systemCannes
“Complete dashboard refit on my Princess. Sound advice on choosing the screens. The result is stunning and very ergonomic.”
Client, PrincessMonaco
“Complete bridge refit: new Garmin MFDs, Doppler radar and electrical network overhaul. Surgical work, structured and labelled cabling, impeccable technical documentation. True professionalism.”
Client, Garmin bridgeMonaco Yacht Show

Your vessel deserves the same rigour

Describe your project or your fault: Stéphane answers you directly.

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