Professional Maritime Resources
Essential tools every serious sailor should know. Curated from years of professional Mediterranean and Atlantic sailing.
Essential Tools for Professional Navigation
After years of professional sailing across the Mediterranean, Atlantic routes, and challenging waters like the Bay of Biscay, we’ve learned that having the right resources at your fingertips can make the difference between a smooth passage and a stressful ordeal. Whether you’re planning a delivery from La Rochelle to the Balearics or navigating the complex weather patterns around Gibraltar, these carefully curated resources have proven invaluable in our daily operations.
This collection represents years of real-world experience—tools we actually use, not just theoretical recommendations. From weather routing software that’s helped us avoid severe Mistral conditions to marina guides that have saved us time in busy ports from Barcelona to Palma, these resources form the backbone of professional sailing operations.
📍 Nautical Charts and Cartography
Accurate nautical charts are the foundation of safe navigation. These official hydrographic services provide the most reliable cartographic data for Mediterranean and Atlantic operations.
Italy
Istituto Idrografico della Marina (IIM)
www.istitutoidrografico.it
Italy’s official hydrographic institute. Traditional and electronic nautical charts, pilot books, ephemerides, complete Italian cartography catalogue.
Spain
Instituto Hidrográfico de la Marina (IHM)
Spanish Hydrographic Institute
Official Spanish nautical charts, Western Mediterranean, Balearics, Canaries, Atlantic.
Portugal
Instituto Hidrográfico Português
www.hidrografico.pt
Portuguese nautical charts, Atlantic coast, Azores, Madeira. Nautical publications and notices to mariners.
United Kingdom
UK Hydrographic Office (UKHO)
www.admiralty.co.uk
British Admiralty charts, worldwide coverage. Professional nautical publications, ECDIS, ADMIRALTY Digital Charts.
France
SHOM – Service Hydrographique et Océanographique de la Marine
www.shom.fr
French nautical charts, Atlantic coast, Mediterranean, Corsica. Essential for navigation from/to La Rochelle and Brittany.
Free & Open Source
OpenSeaMap
map.openseamap.org
Free collaborative nautical charts, open source. Useful for general planning and OpenCPN integration.
OpenCPN
opencpn.org
Free open source electronic navigation software. Compatible with free and commercial nautical charts.
🌦️ Marine Weather and Forecasts
Weather is everything in professional sailing. These are the services we rely on for accurate, detailed forecasting across our operating areas.
⭐ Essential Services
PassageWeather ⭐ ESSENTIAL
www.passageweather.com
The worldwide reference for marine weather forecasts. Wind, waves, pressure for oceanic and Mediterranean routes. Indispensable for Atlantic deliveries, Gibraltar, Mediterranean.
Windguru ⭐ ESSENTIAL
www.windguru.cz
Detailed wind and wave forecasts for specific locations. Multiple weather models (GFS, ECMWF, ICON). Ideal for programming delivery weather windows.
Windy
www.windy.com
Real-time graphical visualization of wind, waves, pressure, currents, sea temperature. Intuitive interface, excellent mobile app.
PredictWind
www.predictwind.com
Professional weather forecasts, optimized routing, forecast departure planner. Premium service for oceanic navigation.
Specialized Mediterranean
AEMET (Spanish Met Service)
Spanish marine forecasts
Official Spanish marine bulletins. Mediterranean, Balearics, Atlantic, Canaries.
Météo-France Marine
French marine forecasts
Official French forecasts Atlantic coast and Mediterranean. Essential La Rochelle, Brittany, Corsica.
Aeronautica Militare – Meteomare
Italian marine bulletins
Official Italian marine bulletins. Sea state, wind, visibility for Italian basins.
IPMA (Portugal)
Portuguese marine forecasts
Marine weather Portuguese coast, Azores, Madeira.
Met Office (UK)
Met Office Marine
Official British maritime forecasts. Channel, Atlantic, UK approaches.
GRIB Files & Downloadable Data
zyGrib
www.zygrib.org
Free software to visualize GRIB files. Download wind, wave, pressure forecasts from GFS and ECMWF models.
SailDocs
www.saildocs.com
Request GRIB files via email. Essential for oceanic navigation with limited connectivity.
⚓ Maritime Ordinances and Regulations
Understanding local maritime regulations is essential for professional operations. These official sources provide current ordinances and safety bulletins.
Italy ⭐
Guardia Costiera (Italian Coast Guard) – Ordinances ⭐ FUNDAMENTAL
Complete ordinances with map
Complete database of Italian Coast Guard ordinances. Search by geographic area or Harbor Master. Real-time updates.
Avvisi ai Naviganti – IIM
Notices to Mariners
Weekly publication of Italian notices to mariners. Chart updates, hazards, works in progress.
Spain
Salvamento Marítimo
www.salvamentomaritimo.es
Spanish maritime rescue service (SASEMAR). Weather warnings, navigation safety, SAR coverage.
Avisos a los Navegantes
Spanish notices to mariners
Publication of Spanish notices to mariners. Cartographic updates.
📡 Tracking, AIS and Traffic Information
Real-time vessel tracking and traffic information helps avoid commercial shipping and understand port congestion.
MarineTraffic ⭐
www.marinetraffic.com
Real-time AIS vessel tracking worldwide. Information on ports, fleets, routes. Excellent mobile app. Essential for avoiding commercial traffic.
VesselFinder
www.vesselfinder.com
Vessel tracking, ship positions, technical information, historical routes.
FleetMon
www.fleetmon.com
Professional AIS tracking, port statistics, ship arrival predictions.
ShipFinder
www.shipfinder.com
Mobile AIS tracking app. Useful for monitoring traffic while underway.
🧭 Routing and Passage Planning
Effective route planning combines accurate distance calculations with weather window optimization.
Route Calculation
PredictWind Offshore
Professional routing
Calculate optimal route based on weather forecasts. Departure planner for ideal weather windows. Premium but excellent for oceanic deliveries.
Sea-Distances.org
sea-distances.org
Quick calculation of maritime distances between worldwide ports.
Ports.com
ports.com
Worldwide commercial ports database. Technical information, services, contacts.
Specific Routes
La Rochelle – Gibraltar
Recommended stops: La Coruña, Vigo, Lisbon, Cadiz
Ideal season: May-September
Caution: Cape Finisterre (variable weather), Bay of Biscay (challenging September-April)
Gibraltar – Western Mediterranean
Common destinations: Balearics, Alicante, Cartagena
Note: Gibraltar Strait crossing requires attention to currents (up to 3-4 knots) and heavy commercial traffic
📻 Maritime Communications
Essential VHF Frequencies
– Ch 16: Emergencies and calling (156.800 MHz)
– Ch 13: Navigation safety, port communications
– Ch 09: Alternative port communications
– Ch 06: Inter-ship safety
– Ch 72: Inter-ship communications (non-interference)
– DSC Ch 70: Digital Selective Calling (automatic)
NAVTEX Online
NAVTEX Messages
NAVTEX messages for navigation safety. Weather warnings, navigation, SAR.
GlobalMRCC
Global Maritime Rescue
Database of worldwide Maritime Rescue Coordination Centers (MRCC) with frequencies and contacts.
🌊 Oceanographic Information and Currents
Copernicus Marine Service
marine.copernicus.eu
European marine monitoring service. Satellite data on currents, SST (sea surface temperature), salinity.
NOAA – Ocean Currents
NOAA oceanographic data
Ocean currents, sea temperatures, satellite data. Essential for Atlantic crossings.
EasyTide (UKHO)
UK Tides
Official Admiralty tide predictions for UK and European coasts.
Tides and Currents – NOAA
Tides and currents
Tide and tidal current predictions for US coasts and territories.
📱 Recommended Mobile Apps
Navigation & Charts
- Navionics – Vector nautical charts, worldwide leader app
- iNavX – Compatible with multiple nautical charts, GRIB, AIS
- OpenCPN Mobile – Mobile version of open source software
- SeaPilot – Professional navigation, ECDIS support
Weather
- Windy – Graphical weather visualization, best free app
- PredictWind – Weather routing, departure planning (premium)
- SailGrib WR – GRIB files, routing, excellent for offshore
- Windfinder – Detailed wind and wave forecasts
AIS & Tracking
- MarineTraffic – Global AIS tracking, ship info
- ShipFinder – Real-time AIS
- Boat Beacon – Broadcast your AIS position via smartphone
Safety & Communications
- SafeTrx – Float plan, tracking, MOB alert
- Anchor Watch – Anchor drift alarm
- First Aid at Sea – Marine first aid
🚨 Maritime Emergency Numbers
Italy
Guardia Costiera (Italian Coast Guard)
Tel: 1530 (national number)
VHF: Ch 16
MRCC Roma: +39 06 5922 8301
Spain
Salvamento Marítimo
Tel: 900 202 202
VHF: Ch 16
MRCC Madrid: +34 91 755 91 33
France
CROSS (Atlantic zone)
Tel: 196 (landline France)
VHF: Ch 16
CROSS Etel (Brittany): +33 2 97 55 35 35
UK
HM Coastguard
Tel: 999 or 112
VHF: Ch 16
MRCC Falmouth: +44 1326 317575
💡 Tips for Professional Deliveries
Professional sailing isn’t about having the most expensive equipment—it’s about having reliable, accurate information when you need it. Over the years, we’ve seen weather windows open and close, dealt with mechanical failures in remote anchorages, and navigated complex port procedures across multiple countries.
Pre-Departure Planning
- Check harbour master ordinances for departure/arrival/waypoints
- Verify updated NAVTEX and notices to mariners
- Cross-reference at least 3 weather sources
- Plan weather windows with PredictWind or similar
- Verify commercial traffic on routes (MarineTraffic)
- Download updated nautical charts for navigation area
- Prepare GRIB files for offshore navigation
Critical Routes
- Strait of Gibraltar: Currents up to 4 knots, very heavy traffic, cross with favorable current
- Bay of Biscay: Avoid September-April, fast-moving depressions, short steep waves
- Cape Finisterre: Variable winds and sea, give wide berth in adverse conditions
- Bonifacio Strait: Strong currents, accelerated wind (Libeccio), ferry traffic
Seasonality
Mediterranean → Atlantic
Best: May – September
Avoid: November – March (Bay of Biscay challenging)
Why These Resources Matter
Whether you’re planning your first Mediterranean crossing or you’re a seasoned professional looking to expand your resource library, these tools represent years of real-world testing across diverse conditions. From delivering new Lagoon catamarans from La Rochelle to skippered charters in the Balearics, from emergency repairs in Sardinian boatyards to weather routing around Atlantic storms, these resources have proven their worth time and again.
The maritime environment is unforgiving of poor preparation. Having immediate access to accurate weather data, reliable navigation tools, and emergency services isn’t just professional best practice—it’s essential for safe, efficient operations. Captains and Crew has built its reputation on this attention to detail and comprehensive preparation, and we’re pleased to share these resources with the broader sailing community.
Need Professional Maritime Services?
From yacht deliveries to skippered charters, the professionals we work with use these resources daily to ensure safe, efficient operations across the Mediterranean and on delivery routes from Northern Europe.
🏴 Flags and Nautical Etiquette
Flag Etiquette
Nautical flag etiquette
Guide to flags: positioning, courtesy, international protocol.
International Code of Signals
ICS Signals
International maritime signals code (alphabetic, numeric flags, substitutes).
🛠️ Nautical Tools and Calculators
Nautical Calculator
www.nauticalcalculator.com
Nautical calculators: conversions, distances, speed, fuel consumption, dead reckoning.
Boat Speed Calculator
Maximum theoretical hull speed (displacement):
Vmax (knots) = 1.34 × √LWL (feet)
LWL = Length at waterline
Fuel Calculator
Engine fuel consumption estimate:
Consumption (l/h) = HP × 0.22 (4-stroke diesel engines)
Consumption (l/h) = HP × 0.30 (4-stroke petrol engines)
Time Calculator
Navigation time = Distance (miles) ÷ Average speed (knots)
📚 Pilot Books and Nautical Guides
Imray Pilot Books
Imray Pilots
English pilot books, worldwide reference. Mediterranean, Atlantic, Channel, Europe.
RCC Pilotage Foundation
RCC Pilots
Detailed pilot books for Atlantic navigation and less-traveled destinations.
Derroteros (Spain)
Spanish pilot books
Official Spanish pilot books Iberian coast, Balearics, Canaries.
Portolano IIM
Available at Italian Hydrographic Institute
Detailed descriptions Italian ports, anchorages, services, aerial photographs.
⚙️ Maintenance and Checklists
Pre-Departure Checklist:
- Check engine system (oil, filters, belts, coolant)
- Test all electrical and electronic systems
- Check sails (stitching, shackles, sheets)
- Verify safety equipment (lifejackets, flares, liferaft, EPIRB)
- Test VHF/SSB, AIS, GPS, autopilot
- Check hull seals, seacocks, vents
- Verify lockers, stowage, secure objects underway
- Refuel, water, provisions
- Documentation: nautical charts, pilot books, boat papers
🎓 Training and Certification
RYA (Royal Yachting Association)
www.rya.org.uk
Internationally recognized British certifications. Day Skipper, Coastal Skipper, Yachtmaster Offshore, Yachtmaster Ocean.
MCA (Maritime and Coastguard Agency)
UK commercial certifications
Professional certifications for commercial yachts (over 24m).
STCW Training
Standards of Training, Certification and Watchkeeping
Mandatory certifications for professional commercial navigation.
Captains and Crew Academy
C&C Academy
Professional skipper training, delivery crew, oceanic miles, exam preparation.
📖 Additional Resources
Cruisers Forum
www.cruisersforum.com
International cruising community. Information on ports, routes, shared experiences.
Noonsite
www.noonsite.com
Practical information on worldwide nautical destinations. Formalities, anchorages, services.
Yacht Help
www.yachthelp.com
Worldwide yacht assistance services. Repairs, supplies, crew.
Disclaimer: Information provided for informational purposes. External links lead to third-party sites for which we are not responsible. Always verify source reliability and currency. For professional navigation, always consult official and updated sources.
Last updated: February 2026