SYSTEM OVERVIEW
iv
Use of AIS in collision avoidance
As an anti-collision aid, the AIS has the following advantages over radar:
• Information provided in near real-time
• Capable of instant presentation of target course alterations
• Not subject to target swap
• Not subject to target loss in clutter
• Not subject to target loss due to abrupt maneuvers
• Able to “detect” ships within VHF/FM coverage, including in some circumstances, around bends
and behind islands.
When using the AIS for anti-collision purposes it is important to remember that the AIS is an ad-
ditional source of navigation information. It does not replace other navigational systems. The AIS
may not be giving a complete or correct “picture” of shipping traffic in its vicinity.
The use of the AIS does not negate the responsibility of the OOW to comply with all collision reg-
ulation requirements, especially the maintaining of a proper look-out. The prudent navigator uses
all aids available to navigate the ship.
Erroneous information
Erroneous information implies a risk to other ships as well as your own. Poorly configured or im-
properly calibrated sensors might lead to incorrect information being transmitted. It is the user’s
responsibility to ensure that all information entered into the system is correct and up to date.
