Obstruction Alarm (Lighthouse Charts); Course Change; Speed Change; Obstruction Alarm Parameters - Raymarine LIGHTHOUSE 3 Advanced Operation Instructions

Course change

When both vessels are travelling at the same speed, course alterations should be made in
accordance with the guidance provided in examples 1 and 2.

Speed change

When both vessels are travelling at the same speed, altering your speed will change the collision
scenario to one of the scenarios detailed in examples 1 and 2.

Obstruction alarm (LightHouse charts)

The Obstruction alarm provides a warning if a charted object, charted depth contour or charted
height clearance is detected that conflicts with the MFD's configured Safety depth and / or Safety
height settings.
Note:
• The Obstruction alarm requires LightHouse™ charts or Legacy LightHouse™ vector charts as
the alarm's Cartography source.
• Object depths, depth contours and clearance heights are based on the cartography in use.
• If an obstruction is not present in the specified Cartography source it will not trigger the alarm.
When the Obstructions alarm is triggered an alarm notification is displayed and an audible beep is
sounded on the MFD. From the onscreen notification you can acknowledge the alarm by selecting
OK, or edit the alarm parameters by selecting Edit.

Obstruction alarm parameters

The Obstruction alarm parameters must be configured from the Alarm manager before it can be
used: Homescreen > Alarms > Settings > LightHouse chart obstructions.
The following options must be configured for correct operation:
• LightHouse chart obstructions — Enables and disables the obstruction alarm.
• Indication only — Enables and disables the warning notification dialogue (Audible beep and Red
detection zone outline only).
• Cartography source: — Choose the LightHouse chart relevant for you region.
• Safety depth — Specifies the minimum safe depth for your vessel. The Chart app's Safe contour
depth value is synchronized with the Safety depth value.
• Safety height — Specifies the minimum height for your vessel.
• Obstruction warning ahead — Specifies how much time in advance of reaching the obstruction
the alarm will be triggered. This means the faster your vessel speed is the farther ahead the
detection zone will be drawn.
• Minimum obstruction distance — Specifies the minimum distance from your vessel to port,
starboard, aft and when motionless, fore. The detection zone is displayed in the Chart app as an
oblong shape around your vessel which turns Red when an obstruction is detected.
Chart app
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