ECDIS Test

Multiple Choice

If you set Safety Depth to 10m and Safety Contour to 15m on an ECDIS, which value will trigger the audible alarm when crossing the dangerous depth line?

• Safety Depth

• Safety Contour

• Both values

• Neither value

Multiple Choice

What is the primary purpose of the Safety Contour in ECDIS?

• To show the ship’s route

• To indicate safe water for navigation

• To highlight dangerous depths for the vessel

• To display tidal information

Multiple Choice

Why is it important to be cautious when planning a route through an area marked as CATZOC U (Unassessed) on an electronic chart?

• Because the area is shallow

• Because the data is unverified and depth is unknown

• Because the area is restricted

• Because the area is frequently updated

Multiple Choice

What is the function of the SCAMIN (Scale Minimum) attribute in ECDIS when zooming in on a port?

• It increases the brightness of the screen

• It hides less important objects at smaller scales to reduce clutter

• It changes the color of navigation symbols

• It disables alarms for obstacles

Multiple Choice

If the officer does not set the Safety Contour value before the voyage and the ECDIS system loses its default settings, what value will the system automatically use according to IHO standards?

• 10 meters

• 15 meters

• 20 meters

• 30 meters

Multiple Choice

Base vs. Standard Display Mode: When passing through a narrow channel, an officer uses Base Display mode. Is this correct and safe?

• Yes, you can safely navigate in this mode

• Yes, provided it enables additional depths

• No. Base mode does not include information about wrecks, obstructions, or underwater cables. For navigation, you must use at least Standard Display or All mode.

• This is a correct action but not very safe.

Multiple Choice

What does an alarm “Crossing Safety Contour” indicate?

• The vessel is entering a traffic separation scheme

• The vessel is approaching land

• The vessel is moving into water shallower than the safety contour

• The vessel is off track

Multiple Choice

What is the function of the Look-Ahead (Route Checking) feature in ECDIS?

• It predicts weather conditions

• It checks the route for dangers ahead of the vessel

• It increases GPS accuracy

• It controls autopilot

Multiple Choice

What does ENC stand for in ECDIS?

• Electronic Navigation Chart

• Electronic Nautical Chart

• Electronic Navigation Control

• Electronic Nautical Control

Multiple Choice

What is the role of the Presentation Library in ECDIS?

• It stores voyage plans

• It defines how chart data is displayed

• It controls radar overlay

• It updates GPS signals

Multiple Choice

What happens if the ECDIS is operated without an official ENC?

• It operates in RCDS mode using raster charts

• It works normally

• It switches to radar mode

• It shuts down automatically

Multiple Choice

What is the purpose of the “Isolated Danger” symbol in ECDIS?

• Indicates shallow water areas

• Shows anchorage areas

• Indicates traffic lanes

• Marks a single hazard surrounded by safe water

Multiple Choice

Why is it important to update ENC data regularly?

• To improve screen resolution

• To ensure up-to-date navigational information

• To reduce power consumption

• To calibrate GPS

Multiple Choice

What is the function of the “Off-Track” alarm in ECDIS?

• Alerts when vessel deviates from planned route

• Alerts when vessel speed is too high

• Alerts when entering shallow water

• Alerts when GPS signal is lost

Multiple Choice

What does the term “Overscale” indicate in ECDIS?

• The chart is too detailed

• The vessel is outside chart coverage

• The chart is displayed beyond its intended scale

• The system is overloaded

Multiple Choice

What is the main risk of using ECDIS in “All Display” mode during navigation?

• Reduced system performance

• Loss of GPS signal

• Automatic disabling of alarms

• Excessive information leading to clutter and reduced situational awareness

Multiple Choice

According to IMO requirements, when can ECDIS be used as the primary means of navigation?

• Always, regardless of backup

• Only with updated ENCs and an approved backup arrangement

• Only in coastal waters

• Only in coastal waters

Multiple Choice

What is the consequence of setting an incorrect Safety Depth?

• No impact on navigation

• Incorrect highlighting of safe and unsafe water

• Loss of AIS data

• Radar malfunction

Multiple Choice

What does a “Position Lost” alarm typically indicate in ECDIS?

• Loss of position input (e.g., GPS signal)

• Gyrocompass failure

• Incorrect route planning

• Radar overlay error

Multiple Choice

What is the purpose of “Chart Datum” in ECDIS?

• To define chart color schemes

• To control zoom levels

• To manage AIS targets

• To specify the vertical reference for depths and heights

Multiple Choice

What is a key limitation of Radar Overlay on ECDIS?

• It replaces ENC data

• It disables alarms

• It may be misaligned due to sensor errors (e.g., gyro or position)

• It reduces chart accuracy permanently

Multiple Choice

What is the function of the “Pick Report” tool in ECDIS?

• To measure distances

• To retrieve detailed information about a chart object

• To activate alarms

• To edit the route

Multiple Choice

What is the risk of over-reliance on GPS input in ECDIS?

• Increased fuel consumption

• Potential navigation errors if GPS signal is degraded or spoofed

• Loss of ENC data

• Incorrect chart colors

Multiple Choice

What does the term “CATZOC A1” indicate on an ENC?

• Area with high accuracy and reliable survey data

• Area with poor survey quality

• Restricted military zone

• Area with no depth information

Multiple Choice

What is the correct action if ECDIS alarms are frequently triggered and considered nuisance alarms?

• Disable all alarms

• Ignore them

• Investigate and adjust settings appropriately without compromising safety

• Switch off ECDIS

Multiple Choice

Narrow Channel + Wrong Display Mode

You are navigating through a narrow channel at night. The ECDIS is set to Base Display. The radar overlay is active and looks correct. No alarms are triggered.

What is the correct action?

• Continue navigation, radar is sufficient

• Switch to Standard or All Display immediately

• Reduce speed only

• Turn off radar overlay

Multiple Choice

Safety Contour vs Actual Draft

Your vessel’s draft is 11.5 m. Safety Contour is set to 10 m due to oversight. You are approaching a 12 m depth area.

What is the main risk?

• No risk

• Alarm will trigger too early

• ECDIS will show the area as safe while it is not

• GPS error

Multiple Choice

GPS Spoofing Scenario

While at sea, the vessel suddenly appears to shift position on ECDIS, but radar overlay does not match coastline.

What should you do FIRST?

• Ignore the issue

• Immediately change route

• Restart ECDIS

• Cross-check position using independent means (radar, visual bearings)

Multiple Choice

CATZOC U Area Transit

You are planning a route through an area marked CATZOC U (Unassessed) to save time.

Best decision?

• Avoid area or apply significant safety margins

• Proceed normally

• Increase speed to pass quickly

• Turn off alarms

Multiple Choice

Alarm Fatigue Situation

During coastal navigation, multiple alarms (shallow contour, AIS, off-track) are triggering frequently, distracting the officer.

What is the best practice?

• Disable alarms

• Ignore alarms

• Adjust alarm parameters carefully and investigate causes

• Switch off AIS

Multiple Choice

Loss of ENC Updates

You realize that ENC updates have not been applied for 3 weeks before entering a busy port.

What is the correct action?

• Proceed as usual

• Apply updates or verify critical information with other sources before entry

• Switch to paper charts only

• Ignore the issue

Multiple Choice

Radar Overlay Misalignment

Radar overlay is slightly offset from charted coastline. GPS position seems stable.

What is the likely cause?

• ENC error

• Gyro or heading sensor error

• Depth sensor issue

• SCAMIN setting

Multiple Choice

Route Check Before Departure

You perform a route check and ECDIS shows multiple warnings along the route.

What should you do?

• Ignore warnings if route looks correct

• Accept all warnings automatically

• Analyze each warning and modify route or safety settings accordingly

• Disable route checking

Multiple Choice

Entering Shallow Waters

You are approaching shallow waters. Safety Depth and Safety Contour are correctly set, but no alarm is triggered.

Possible explanation?

• ECDIS malfunction

• ENC lacks detailed depth data

• GPS failure

• Radar failure

Multiple Choice

Backup Arrangement Failure

ECDIS is your primary navigation system, but the backup ECDIS suddenly fails during voyage.

What is the correct action?

• Continue using single ECDIS

• Reduce speed and continue

• Switch to alternative navigation method (e.g., paper charts) immediately

• Ignore backup requirement

Multiple Choice

Safety Settings Conflict

You take over the watch. Draft: 12.8 m. Safety Depth: 10 m. Safety Contour: 20 m
Route passes through “unsafe” areas.

What do you do?

• Continue as planned

• Increase speed

• Adjust safety settings according to draft and re-check route

• Disable safety contour

Multiple Choice

Track Control + Current

Vessel is on Track Control. Strong current is setting the vessel off track toward shallow water.

What is your action?

• Trust ECDIS to correct automatically

• Switch to manual control and monitor cross-track error

• Ignore as long as alarm is not triggered

• Turn off alarms

Multiple Choice

Echo Sounder Discrepancy

Echo sounder shows shallower depth than ECDIS.

What is the most appropriate action?

• Investigate datum differences and cross-check with other sources

• Ignore echo sounder

• Assume ECDIS is correct

• Increase speed

Multiple Choice

Visual vs ECDIS Conflict

ECDIS shows safe water, but you see breakers ahead.

What do you do immediately?

• Continue on route

• Trust ECDIS

• Alter course to safe water and verify position

• Turn off radar

Multiple Choice

SCAMIN Effect

Navigation marks disappear when zooming out.

What is the correct action?

• Ignore missing objects

• Restart ECDIS

• Switch off ENC

• Zoom in or adjust display to show hidden objects

Multiple Choice

No Alarm Near Danger

You approach a known shoal, but no alarm is triggered.

What is the best explanation?

• ECDIS is always wrong

• Alarm system failure

• Possible data limitation or incorrect settings

• GPS failure

Multiple Choice

TSS Crossing Error

Your planned route crosses a Traffic Separation Scheme at a shallow angle.

What should you do?

• Continue as planned

• Increase speed

• Modify route to cross at right angles

• Disable AIS

Multiple Choice

Temporary ECDIS Freeze

ECDIS freezes briefly and resumes normal operation.

What is your response?

• Ignore the issue

• Cross-check position and prepare backup navigation

• Restart system immediately

• Turn off radar

Multiple Choice

ENC Update Change

After updating ENC, new shallow areas appear on your route.

What should you do?

• Ignore changes

• Continue as planned

• Delete update

• Re-check and adjust route if necessary

Multiple Choice

High Workload Situation

Heavy traffic, many AIS targets, multiple alarms.

Best action?

• Disable alarms

• Ignore AIS

• Prioritize critical information and reduce display clutter

• Turn off ECDIS