ECDIS Flashcards
How do you check that your ECDIS SYSTEM is up to date with IHO s-52 presentation library 4.0
Check chart 1 on your ECDIS! It shows you a legend and if you’re ECDIS is up to date then you will see the new up to date symbols in the legend!
It is an isolated danger of depth less than the safety contour.
Ships required to be fitted with ECDIS:
Passenger over 500GT
Cargo over 3000GT
Explain “sunsetting of paper charts”
UKHO withdrawal from paper charts, supplemented by digital products by 2026.
How to know your ECDIS is approved:
(5)
Type approval certificate
Has backup power source (UPS)
Connected to required sensors
(Gyro, speed, GPS, emergency power)
Appropriate backup arrangement
Maintained to latest IMO standards
~> IHO S-52, 4.0
Nav. charts as backup must be updated
S-52 4.0?
Ensures standardisation of all symbology across all ECDIS terminals.
What does DPPC check?
How is this done?
DATA PRESENTATION PERFORMANCE CHECK
Checks important aspects of function.
2 fictitious ENC cells can be loaded.
~> Open ECDIS CHART 1, features to be checked compared to fictitious cells.
If data can be displayed ECDIS meets S-52 4.0 standards.
What is an ENC?
Database of individual items & digitised chart data.
Benefits of ENC:
(4)
Detail displayed automatically minimised with scale to reduce clutter
Interrogation to extract more information.
Vector charts offer layered information
Depth contour alarms
What is an RNC?
Raster Nav Chart, facsimile of paper chart.
When may RNC be used and what must be done prior?
When ENC data is not available for a certain region.
Risk assessment must be done according to MGN285
Key differences between ENC & RNC:
(5)
RNC not in chart up: symbols wont be upright
RNC quality degraded acc. to zoom
RNC will not trigger alarms automatically (clearing lines, safety contour must be manually set by user)
RNC not possible to interrogate data
RNC charted features cannot be removed
Where to get charts aswell as subscription options:
AVCS
Admiralty Vector Chart Service
3, 6, 9, 12 month permits offering flexibility.
PAYS
Pay As You Sail
Only charged when your vessel tracks across ENC.
SENC:
System ENC
ENC converted to a format supported by the system in use.
AVCS SENC offers full ADMIRALTY assurance and accreditation
Who supplies ENC permits?
Admiralty Chart Agent when ENC is added or removed.
Weekly AVCS updates:
Provided by?
What form do they come in?
Adm. chart agent, CUMULATIVE.
Come in disc form.
as they are CUMULATIVE only the last disc needs to be uploaded if more than one is supplied
Important file to read before uploading disc?
README FILE
Consisting of 9 folders.
admiralty.co.uk/avcs
2 ECDIS BACKUPS
Independent ECDIS
- Own power supply
- Independent connection to inputs
- Voyage plan to he loaded prior to voyage
Paper charts corrected to latest NM
According to LYC ECDIS BACKUPS for yachts under 3000GT?
3 options
1 x paper chart folio
1 x ECDIS system
+
1 x paper chart folio
2 x Independent ECDIS systems
3 places where Chart symbol information be found:
Catzocs
Symbol for “isolated query”
Symbols for unreliable depths
UK chart 5011 (ECDIS)
UK chart 5012 (paper)
US chart 1
6 limitations of ECDIS:
Over reliance
Requires power
Software needs to help updated
Need education on system
Alarm management
Screen cluttter
4 advantages of ECDIS:
Reduce OOW workload
Situational awareness
Appreciation of ROC
Real-Time position display
8 Disadvantages of ECDIS:
Over reliance on position fixing (GPS)
Over reliance on system
Vulnerability of power supplies
Inappropriate depth + XTD settings = Disaster!
Screen clutter
Training
Undetected errors
Update (S-52)
Equation for safety depth
SD = Draught + UKC (inc. squat + safety margin) - HoT
What will the ECDIS do if it loses GPS input?
Goes into Ded Reckoning mode (speed & heading)
6 Mandatory alarms:
Different Geodetic datum
Position fixing error
Deviation from route
Crossing into specific area
Crossing safety contour
Approach to critical point
7 Indications or warnings:
Larger ENC scale available
Information overscale
Different reference system
Position test failure
Position system failure
Route planning across safety contour
Route planning across specified area
