Computerised navigation requires four primary components:

Navigation Software
DigiBOAT provides this for Windows users as Software-On-Board (SOB). SOB is free of charge for a 3 month (90 days) trial period, and thereafter reverting to a free LITE version or pay to upgrade your copy to the Standard or Pro Licensed version.

Computerised Charts
C-MAP Electronic Charts are the industry leader and are fully compliant with SOB.
SOB will read MAX and NT/NT+ C-MAP charts: NTonPC, MAXonPC, or Cartridge (USBMM, USBCC, USBFP, PCMCIA) formats. SOB cannot read CM93 or Max Pro charts.

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Computer
Any recent model laptop or desktop with at least 128Mb RAM, running Windows™ 2000 or newer operating system.

C-map Cm93 Edition 2

Positioning Device (GPS)
Almost any GPS manufactured since 1993 should work with SOB. The GPS must be NMEA 0183 compatible or part of a NMEA 2000 backbone*. Some older models may require data interface boxes which may no longer be available. Any GPS manufactured in the past 10-15 years is sure to be suitable, and apart from requiring a data cable (a standard accessory), will be pre-configured to work with little or no setup. Modern USB or Bluetooth connected GPS units are suitable for use with SOB.

ECDIS - Electronic Chart Display and Information System
ECDIS defines a complete computerised navigation solution including the charts, computer hardware, GPS and required system features. These complete solutions are built to specifications from official international bodies such as SOLAS, IMO and IHO and are recognised as true replacements for paper charts and traditional navigation methods. Simply installing a nav program and electronic charts on your laptop does not comprise an ECDIS solution. Check with your National maritime body whether this setup is a legal replacement for paper charts in your country.

The advent of electronic chart technology has left ship and boat owners with an unprecedented tool to aid in safe and efficient navigation. But while the electronic advances have swept interest and headlines around the world, they have also created a considerable amount of confusion regarding, for example, when electronic charts can legally replace paper versions.

With the notion of clearing the air, MR/EN has spoken with one of the world's leading companies in the field, CMap, to discuss the ins and outs of new electronic chart technology.

Currently, ship owners are focusing on the availability of quality electronic chart data for ECDIS. C-Map, being the largest supplier of charts in digital format, has responded to the requirements by offering worldwide coverage on CD ROM. The data from C-Map is coded in proprietary System Electronic Navigational Chart (SENC), optimized for direct use by the onboard ECDIS computer. This format, dubbed CM93 by C-Map, has been adopted by many manufacturers of ECDIS systems (Please see Table l).

ENC & ECDIS It is imperative to note that only National Hydrographic Offices (HOs) can issue Electronic Navigation Charts (ENC) data as a paper chart replacement. HOs can, and do. subcontract work to commercial companies, but the HO is ultimately responsible for data quality control. Only when ENCs are displayed on a typeapproved ECDIS system can they replace paper charts.

The International Hydrographic Organization (IHO) has defined the ENC chart format specified in the S-57 Edition 3 (S- 57/3) product specification, which is a detailed format developed as a data exchange format to be used by HOs. It is not a format designed to be manipulated and displayed on a navigation screen, and for this reason the ECDIS Performance Standards accept that ENC data is compiled into an internal format in the ECDIS system, or in a SENC format. Thus, one of the more critical steps is ensuring the integrity of the data when compiling from ENC to SENC format. The presentation of nautical charts and symbols on a navigation system is defined by the IHO as well, in the S52 specification, which is also referred to in the ECDIS Performance Standards.

Partnerships C-Map, in effect, acts as a link between the HOs and the users of digital nautical charts, and the company is constantly developing new technology and services to achieve this goal. C-Map is not only working with HOs to digitize paper charts, but working with them also to develop their national ENC portfolios in S-57/3. C-Map developed the CM-93 Edition 3 (CM-93/3) format that fully complies with the S-57/3 format as defined by the IHO.

Data produced by C-Map is produced in CM-93/3 format, which is used by a number of system manufacturers as their SENC format. C-Map has developed software that compiles S-57/3 data in CM- 93/3 format. The compiler was typeapproved by DNV, to ensure that there is no loss or corruption of data in this process. This compiler is suppled to system manufacturers that use CM-93/3 as a SENC to enable their systems to read S- 57/3 data directly.

C-map Cm93

The CM-93/2 chart portfolio of 13,900 chart files produced by C-Map has been converted into the same CM-93/3 SENC format, but it can only be used as an aid to navigation. ECDIS systems that use CM- 93/3 have access to extensive chart coverage.

As ENC data becomes available, this will take priority over other data and be clearly recognized as official data when displayed, but unfortunately only limited ENC data is presently available.

Distributing charts in the SENC format means that the updating of charts can be carried out via the Internet, or remote access using a shipboard communications line. The SENC format, in effect, is a compressed format (approx. 1:5) in comparison to S-57/3, and additionally, no compression is required onboard.

C-map Cm93/3

Circle 137 on Reader Service Card