ENC

Published by Japan Coast Guard

Electronic Navigational Chart

What is Electronic Navigational Chart: ENC?
The Electronic Navigational Chart is designated solely to the navigational chart published officially by, or on the authorityof a government, authorized hydrographic office, or other relevant governmental institution. Any similar vector chart otherthan ENC are unauthorized ones and unsuitable to meet the legal requirements for provision of nautical charts.
ENC is produced on the basis of the IHO Transfer Standard for Digital Hydrographic Data (S-57 Edition 3.1) provided by
the International Hydrographic Organization (IHO). Accordingly, the official ENCs published by various hydrographic
offices of the world are produced on the common specifications. The Japanese ENCs are produced and published by theJapan Coast Guard.
The basic unit of ENC is called ‘cell’. A cell is a rectangular geographical area defined by two parallels and two
meridians. ENCs are produced for 6 navigational purposes, ranging from a small-scale one incorporating various
information covering a vast area to a large-scale one precisely indicating the information within a limited area necessaryfor vessels’ anchoring and berthing. The cell size and the scales of nautical charts to be used are decided at thediscretion of the responsible national hydrographic office.

Classiﬁcation of ENCs (for Japanese ENCs)
Type

Navigational purpose

Chart scale

Cell size (lat. & long.)

1Overview<1:1,500,001

8, 25 degrees

2

General

1: 300,00 1 to 1:1,500,000

4 degrees3

Coastal

1: 80,001 to 1:300,000

1 degree4

Approach

1:25,001 to 1:80,000

30 minutes

5

Harbour

1: 7,501 to 1:25,000

15 minutes

6Berthing (not yet issued)> 1:7,500

15 minutes

Examples of ENC Display
JP1Overview

JP5Harbour

The above is a display example of ENC for navigational purpose

The above is a display example of ENC for navigational purpose‘Overview’, compiled from nautical charts with scales smaller than‘Harbour’, compiled from nautical charts with scales from1/7,501 to

1/1,500,000. As for the ENCs for this navigational purpose, there are

1/25,000. The ENC for this navigational purpose is composed of

two types of cell sizes, of 8-degree mesh and of 25-degree mesh, both

15-minute mesh cell size, indicating detailed information in a limited

covering a vast area. Any information on coastal areas is not shown.

coverage. Thus, detailed information for anchoring and berthing in aThus, it is used mainly for navigational planning.

harbour can be available.

Use of ENC
In order to use an ENC, a user has to obtain a license by paying a fee for use of the data for a contracted period, but notto purchase an ENC itself. ENC will be supplied by a cell unit, and the user will use ENCs by cell units. For use of ENC,
the user is required to make a contract for each cell unit.

Protection of ENC Data (User Permit, Cell Permit)
All ENCs and Electronic Notices to Mariners (Updates) for updating ENCs are protected from illegal copying, data
falsification or disguising, by means of encryption (data protection treatment) by the Japan Hydrographic Association
based on the IHO Data Protection Scheme (IHO S-63).

What is User Permit?
For use of ENCs, an exclusive ECDIS (Electronic Chart Display and Information System) and software for ENC display
based on the IHO Data Protection Scheme (S-63) are required. Upon purchasing these items, an identification code
called User Permit for each of ECDIS and of ENC display software will be given. Without this User Permit, ENCs cannot
be available.

What is Cell Permit?
Cell Permit is a decrypting code for decoding the data of ENC. It is prepared and issued by the Japan Hydrographic
Association by using the User Permit provided at the time of use contract of ENC. The Cell Permit will be issued to eachcell. Cell Permit will effectively function only for the ECDIS or the software having the User Permit provided at the time ofENC use contract. Since Cell Permit decrypts the encrypted ENC, any ENC cannot be displayed without Cell Permit.

ENC Contract and Ordering
In order to use ENC, a client is necessary to make an ENC use contract. Upon conclusion of the contract by the client, theJapan Hydrographic Association issues License ID (also called User ID) and Password. The License ID and Password arenecessary for all future contracts. Ordering of ENC will be made at a sales agent or by telephone, FAX or e-mail. It will also bemade at the web-shop of the Japan Hydrographic Association.
In selecting ENC cells, a client will use the index appearing on the website of the Japan Hydrographic Association or theprinted sheet of cell index issued by the Association, or the web-page of the Hydrographic and Oceanographic Departmentof the Japan Coast Guard. After contracting the use of ENC, the client will be provided with three types of CDs, i.e. a CD
storing Cell Permit, a CD storing ENC data (Base CD) and a CD storing Electronic Notices to Mariners (Update CD).

Electronic Navigational Chart(ENC)

Electronic Notices to Mariners(Updates)

Cell Permit

Process for Obtaining ENC
The process from obtaining ENC to displaying ENC data are as follows:

１ To purchase ECDIS with necessary tools.
２ To obtain User Permit * together with ECDIS.
３ To send in User Permit and ENC Use Application Form to order ENC.
completion of a use contract, User ID and Password are issued.
４ After
The User ID and Password will be necessary for renewal of contract

ECDIS manufacturer＊ User Permit is an identification code of a display device such as ECDIS.
Upon purchasing, it is given by the ECDIS manufacturer without fail.

１Purchasewill be made in the order of Cell Permit CD, ENC CD and５ Installation
Electronic Notices to Mariners CD.

Obtainor additional ordering.

２３Application
for useIssue

Chart sales agent

JapanHydrographicAssociation

４・License ID
・Password・Cell Permit

Cell Permit

ENC

Electronic Notices
to Mariners

ENC user
Install

ECDIS, etc.

５Contract Period, Additional Contract, Renewal of Contract and Use Fee
The contract period for use of ENC is any of 12 months, 9 months, 6 months or 3 months. When Cell Permit isobtained, ENC can be used.
The use fees are as follows (net price not including consumption tax):
12 months 9 months 6 months 3 months
Price of 1 cell

￥550

￥500

￥400

￥300

In case where additional ENCs are necessary, they will be available from a sales agent as in the case of a newcontract. The closing date of additional contract will be the same closing date of the existing contract. When theclosing date of contract is approaching, a message informing as such will appear on the display of ECDIS. Whenthe contract expires, Electronic Notices to Mariners will become unavailable. Renewal of contract can be madefrom two months before the closing date. The use fee in the renewed contract will be the same as in the newcontract, without any privilege such as a renewal discount.

Electronic Notices to Mariners (Updates)
In using ENC for navigation, it should always be used in an updated condition. The updating information will be supplied
by Electronic Notices to Mariners (Updates) issued on Friday every week. On Electronic Notices to Mariners CD, theupdate information is stored in an accumulating manner. Accordingly, if any updating information has previously been
missing, such information can be found when the latest updating information is obtained. During the ENC contract
period, ENC can be updated by obtaining through either of the following methods:
To obtain from the web page of the Japan Hydrographic Association (http://www.jha.or.jp/en/jha/purchase/enc.html),
where License ID and Password obtained at the first ENC use contract are required. As of the closing date of thecontract, updates cannot be available.
Only to those who so desires, Electronic Notices to Mariners on a charged CD will be provided. As for the charge,
inquiries will be made to a chart sales agent.

Service for Foreign ENCs
The Japan Hydrographic Association is dealing with the following foreign ENCs for use by clients:

Malacca & Singapore Straits ENC

Singapore ENC

South China Sea ENC

Hong Kong ENC

Chile ENC

Ordering of foreign ENCs can be made to a sales agent or the Japan Hydrographic Association.
As for the foreign ENCs, encryption is applied according to IHO S-63 as in the same case of the Japanese ENCs, so thatsuch an ECDIS or ENC display software that is coping with the encryption is necessary.
For details, inquiries will be made to a chart sales agent or JHA.

Chart Sales Agent
Electronic Charts Division
Daiichi Sogo Bldg. 6F, 1-6-6, Hanedakuko, Ota-ku,
Tokyo 144-0041
Tel: +81-(0)3-5708-7093 Fax: +81-(0)3-5708-7094
E-mail: enc-support@jha.jp
Website: http://www.jha.or.jp/en/jha

2012.4