Final answer:
In the IALA Buoyage System, a safe water mark is used to indicate navigable deep water, but it does not mark shallow waters or obstructions.
Step-by-step explanation:
In the IALA Buoyage System, a safe water mark is used to indicate navigable, deep water where vessels can safely pass. It is typically colored with horizontal red and white stripes. However, a safe water mark may not be used to mark shallow waters or obstructions, as this is the role of other buoys in the system, such as the lateral and cardinal buoys.
In the IALA Buoyage System used in maritime pilotage to mark the edges of a channel or indicate routes for safe navigation. While it can indicate many things, a safe water mark may not denote isolated dangers or mark the starboard (right) side of the channel when entering from seaward, as red buoys are used for this purpose.
The safe water mark typically features red and white vertical stripes and can sometimes show a spherical, pointed, or conical topmark. It may emit a white light, but it cannot show red or green lights because these colors are used to indicate port (left) and starboard (right) channels respectively.
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