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Electronic Navigational Charts (ENCs)

Poseidon Navigation Services Ltd are authorised suppliers of Electronic Navigational Charts (ENCs) from a range of manufacturers and can recommend and supply the best solution for your vessel or fleet. ENC’s are digital vector charts produced to International Hydrographic Organisation (IHO) standards.


The IMO mandate for ECDIS implementation has already had a considerable impact on the technology used for modern navigation, leading vessels which fall under the mandate to comply with the carriage requirements for ECDIS within a certain date, meaning that hardware, software and training considerations are required.


Depending on the size of vessel and Flag state regulations, they will need either a single or Dual ECDIS system in order to meet compliance, and in some instances Paper charts can also be retained as a backup. Poseidon can help you with the transition to digital navigation.

ADMIRALTY Vector Chart Service (AVCS)

ADMIRALTY Vector Chart Service (AVCS)

Admiralty Vector Chart Service comprises electronic navigational charts (ENCs) from national hydrographic offices from around the globe and new electronic navigation chart coverage produced by the ADMIRALTY (UKHO) in co-operation with international governments to provide comprehensive and official worldwide coverage.


AVCS is compatible with all type approved ECDIS and holds over 11,000 ENC’s including coverage of most of the world’s major ports. AVCS is the perfect way to make the transition from paper to digital navigation, meeting all SOLAS carriage requirements for navigation with ECDIS systems, and are produced to IHO S57 standards.



C-Map ENCs are made up of ENC data produced and approved by official hydrographic offices and distributed on a type approved SENC format, ready to be installed on type approved ECDIS. The supply is authorized and complies with all official regulations and requirements related to distribution and usage of official electronic navigational charts.

Admiralty Digital Publications (ADP)

Admiralty Digital Publications (ADP)

Admiralty Digital Publications (ADP) are a fully approved digital version of the UKHO’s paper Nautical Publications used by mariners around the world. ADP meets SOLAS carriage requirements and, depending on a vessels flag state, can replace the requirement for carriage of traditional paper publications. Poseidon Navigation Services Ltd is an approved supplier of ADP and offers the full range of titles which are listed below. The software is supplied on a single CD which requires an annual license subscription, and is designed to be used on a Windows PC.

Admiralty Total Tide (ATT)

Admiralty Total Tide (ATT)

Total Tide is the digital version of the Admiralty Tide Tables, making calculating tidal heights easy using a simple graphical interface combined with dynamic heights and curves that change over time, thus enabling the user fast, accurate tidal height and tidal stream predictions.


Total Tide automates the prediction process, reduces the possibility of user error and provides an easy means of viewing both UKC and safe overhead clearances. It contains tidal information for over 7,000 ports and more than 3,000 tidal stream stations worldwide. It is now accepted in place of the paper tide tables as carriage compliant by a growing number of flag states, and also includes tidal stream data.

Admiralty Digital List of Lights (ADLL)

Admiralty Digital List of Lights (ADLL)

This is a digital version of the Admiralty lights list, which comes complete with an easy to use graphical interface. The main advantage to having the digital version is the automatic application of updates, which substantially reduces the time and effort needed by the mariner to keep the list corrected up to date. Weekly updates can be received by CD, via our ‘Challenger’ software, or alternatively by downloading from the UKHO website directly. It is now accepted as a replacement for the paper version by various Flag States.

Admiralty Digital Radio Signals (ADRS)

ADRS is the electronic version of the Admiralty Radio Signals collection, covering Volumes 1 – 6 including pilot services, vessel traffic services and port operations.


The products are licensed annually as follows, and are available in 10 geographic regions:

  • Admiralty Digital Radio Signals Volume 1, 3, 4, 5 (ADRS1, 3, 4, 5) – combined on single license.
  • Admiralty Digital Radio Signals Volume 6 (ADRS6) – single license.
  • Admiralty Digital Radio Signals Volume 2 (ADRS2) – single license.


These products form part of the ADP software, and are updated quickly and efficiently via email or CD every week eliminating the need for time consuming manual updates. ADRS is now accepted in place of the paper version by a growing number of Flag States.

Admiralty e-NP

Admiralty e-NP

ADMIRALTY e-NPs are electronic versions of ADMIRALTY Nautical Publications, allowing crews to add NM updates faster and more accurately using a small weekly update file. The following e-NPs are available on a single DVD:


All 75 Sailing Directions, The Mariners Handbook, The Nautical Almanac, Ocean Passages for the World, Annual Summary of Notices to Mariners Part 1, Annual Summary of Notices to Mariners Part 2, ADMIRALTY Guide to the Practical Use of ENCs, Cumulative list of ADMIRALTY Notice to Mariners January, Cumulative list of ADMIRALTY Notice to Mariners June, How to Keep Your ADMIRALTY Products Up-to-Date, IALA Maritime Buoyage System, ADMIRALTY Guide to ECDIS implementation, Policy and Procedures, Symbols and Abbreviations Used on Admiralty Paper Charts, Admiralty Guide to ENC Symbols used in ECDIS

Hardware - Navmaster ECDIS

Navmaster ECDIS

Navmaster ECDIS is a well-established Electronic Chart Display and Information System, incorporating the input of many navigators.  It delivers clear functionality and ease of use in the familiar Windows interface. Traditional navigation skills can be carried out in a modern software application.


Flexible hardware combinations make Navmaster ECDIS as easy to install in existing ships as in Newbuilds, from VLCC bridges to offshore support vessels.  Retrofit installations can take place within sailing schedules, and a complete after-sale training and support service is offered.


Navmaster ECDIS works with all official electronic charts: ENC, CM-ENC, AVCS, ARCS, C-Map Pro/Pro+, AUS-RNC.


  • Key Benefits
  • Advanced route planning & plan documentation
  • GPS, Gyro, speed log, AIS, ARPA, heading, depth, wind, Navtex
  • Easy chart install & updating via email or internet
  • Onscreen access to all main commands
  • Admiralty AIO, TotalTide & e-Navigator compatible
  • Voyage data replay for incident analysis
  • Autopilot control
  • Type-specific Familiarisation: on-board, ashore, via internet
  • Radar image overlay unit – simple to retro-fit
  • Remote diagnostics
  • Pay As You Sail chart option
  • Single ECDIS easily upgradeable to dual via network cable
  • Weather information/ routing: links to MeteoGroup’s Ship Performance Optimisation System (SPOS)

NavMaster Office

Navmaster Office is a chart management tool designed to assist managers in situations where traditionally paper charts would be used. It has varied applications such as emergency response planning, incident management, post-incident analysis, route risk assessment, route planning, port assessment, feasibility studies, moorings management and more. It can be installed on a laptop, desktop or network.


Electronic charts used by Navmaster Office:

  • ENCs
  • ARCS
  • CM-ENCs
  • C-Map Pro