Electronic Chart Display &
Information System
( Day 5 )
IMO Model Course 1.27
UPDATING
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
UPDATING
PRODUCTION AND DISRIBUTION
SOURCE PROVIDER (SP)
 An originator, such as an originating HO
(hydrographic
office),
or
another
information source, such as local authority,
providing warnings.
 SP extracts the electronic navigational chart
data (ENCD) update information from the
electronic chart database (ECDB)
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
Issuing Authority (IA)
 is an entity that assembles ENC update into a data set
from information provided by various sources.
 Responsible for setting up the transfer of the update set.
By the definition, the IA is the issuer of the ENC to which
the update applies.
 The IA under the WEND system is the Regional ENC
coordinating center.
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
Distributor
•
is an entity responsible for packaging, repacking, and or
disseminating and update set to all users, or a group of users. It
disseminates ENC updates to receiver.
 Receiver
• Receives supplies ENC updates to applier. Usually the mariner
on board the ship, or the telecom receiver linked to the ECDIS.
 Applier
• is an entity controlling the application of the update
information, e.g., Mariner keying in update information, or the
software inside the ECDIS automatically processing the ENC
update information.
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
The applier applies ENC updates to
SENC
Manual and Automatic Updating
Manual Updating
• consist of a human operator entering information manually
into the ECDIS, usually based on unformatted update
information, that is not machine readable.
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
Automatic Updating
• consists of an updating process by which
the updating information is applied, within
the ECDIS, to the SENC without operator
intervention. All automatic updating
requires the data to be formatted according
to the relevant ECDIS standards.
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
There are three methods of automatic updating:
 Inactive Updating
• is a method requires the interactive application
of the electronic Notice to Mariners. The
operator determines the corrections from the
notice. Then, using a tool kit, he selects the
symbol appropriate to the correction required,
identifies the location of the symbol, adds the
appropriate textual information identifying the
nature of the correction. This method is labor
intensive and subject to operator error. It also
clutter the screen display because it can be
applied only as an overlay to the ENC data.
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
 Semi-Automatic Updating
• is a method requires, the operator to enter the
correction data furnished in correct digital
format the originating hydrographic office into
the system via electronic medium. The ECDIS
then processes these corrections automatically
and displays an update chart with the changed
data indistinguishable from the remaining
original database.
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
 Fully Automatic Updating
• the full automatic method of updating entry
allows for a direct telecommunications link to
received the official digital update and input it
into the ECDIS. This process is completely
independent of any operator interface. Internal
ECDIS processing is the same as that of semiautomatic updating of the database.
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
ERRORS OF THE DISPLAYED DATA
The potential errors on ECDIS displays are:
 errors in the ECDIS data and display .
 errors in by sensor input
 errors due to difficult reference systems
The potential errors of the ECDIS displays due to:
 inaccurate hydrographic data
 poor resolution
 the shifting of buoys
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
The potential errors in the display of own ship’s position may be
introduced by:
 inaccurate input from the electronic positionfixing system
 inaccurate input of radar data
 different geodetic co-ordinate systems
 reference position of sensors on board
Checking the correctness of displayed data:
 by comparing ECDIS and radar information
 by checking the ship's position by means of a
second independent position fixing system.
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
ERRORS OF INTERPRETATION
The errors of interpretation are due to:
 different modes of vector stabilization
 overscale of the display
 neglecting the 95% probability of the accuracy
standard of the fixing sensor
 automatic track-keeping features
 difference between true north and gyro north
(radar)
N a u t i l u s P a c i f i c
M a r i t i m e
Tr a i n i n g C e n t e r I n c .
To avoid errors of interpretation, always verify the setting of:
 a common reference system
 the appropriate scale
 the sensors best suited for the given situation
 the safety values
 display categories
 usage, etc.
ECDIS
Final Assessment
( Written )
ECDIS
Final Assessment
( Practical – Simulator room )
Final Evaluation
End
Completion of ECDIS Course