ECDIS Flashcards
Which vessels must have ECDIS
Ships engaged on international voyages :
- Passenger Ships, 500GT+
- Cargo Ships, 3,000 GT +
When will the production of paper charts stop?
by 2030
What makes an ECDIS approved
(4)
- Type approval certificate
- Maintained to be compatible with the latest IHO standards
- Connection to emergency source of electrical power, gyro compass, speed log and GPS receiver
- Back up arrangement
52: to view, 57: transfer session
IHO Standards
S-52: Specification for chart content and display of ECDIS
S-57: IHO transfer standard for digital hydrographic data.
Updating ENCs on ECDIS?
ADMIRALTY Chart Agent supply weekly AVCS update data. (cumulative)
To update the ECDIS, just load the ENCs from the latest AVCS discs that you hold.
Read the ‘READ ME’ file before installing update.
ENC v RNC
ENC:
-seamless joins between charts
-safety depth and contour defined and displayed.
-alarms are automatically activated
-chart features can be interrogated
-data displayed selectively
-different symbols for clarity
-may be rotated
RNC:
-familiar presentation
-important information cannot be hidden
- worldwide coverage
- cannot be used as paper chart equivalent
- display can be cluttered.
AVCS. what is it?
Admiralty Vector Chart Service
- ENCs provided under a licence agreement for defined periods of time:
- 3, 6, 9 or 12 months
OR
-PAYS (Pay As You Sail) only charged when your vessel tracks across the coverage of each ENC.
ECDIS back up
(2 options)
Option 1: a second fully compliant ECDIS, independent of the main ECDIS.
Option 2 : a folio of paper charts, fully corrected, showing intended passage plan.
ECDIS Symbols key ones
isolated danger- pink cross
CATZOCs
caution areas
dredged area
question mark- insufficient information to symbolise feature
Regular v hairline sounding (upright + circled indicates a doubtful sounding)
(see AVCS photo)
Limitations of ECDIS
(4)
- over reliance
- alarm management
- incorrect settings and scale
- screen clutter
5.requires power supply
Safety Depth
Value set by mariner
used by ECDIS to portray soundings as
black if equal to or shallower than the value and
grey if they are deeper.
Safety Contour
a specific depth contour set by the ECDIS.
It marks the boundary between “safe water” and shallow water with an
extra wide isoline and is used to give
an alarm if the ship, within a time specified by the mariner,
is going to cross the safety contour.
How to check ECDIS is up to date?
Viewing ECDIS Chart 1 within the ECDIS.
It will not be possible to view the symbols if the ECDIS software is not up to date.
What happens if you lose GNSS?
ECDIS will go into DR mode.
It will continue to do dead reckoning based on heading and log (STW) inputs.
What led to the grounding of Ovit?
-Route was planned over charted bank.
-Route planned by inexperienced officer and not checked by Master.
-Route monitored solely against the intended track.
Inappropriate safety settings
-Audible alarm not working
-Officers were unable to use the ECDIS effectively.
What are the 5 mandatory ECDIS alarms?
- Different Geodetic datum between chart and GNSS.
- Crossing safety contour
- Deviation from route
- Positioning system failure
- Approaching critical point
extra
-ECDIS malfunction
MGN 285
Use of risk assessment methodology when using RCDS.
What do you do before installing a chart update?
read the readme file!
