Bridge manning level should be enough, however, one can add increase the bridge manning level of a navigational watch


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1.1 Overview
General principles of safe manning should be used to establish the levels of
manning that are appropriate to any ship.

The bridge procedures guide
To navigate safely at all times requires effective command, control, communication and management. It demands that the situation, the level of bridge manning, the operational status of navigational systems and the ships' engines and auxiliaries are all taken into account.

There are, however, a number of circumstances and
conditions that could influence at any time the actual watchkeeping
arrangements and bridge manning levels.

Reassessing manning levels during the voyage
At any time on passage, it may become appropriate to review the manning
levels of a navigational watch.


https://www.slideshare.net/MiguelDiazMedina1/the-bridge-proc...

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Watchstanding, or watchkeeping, in nautical terms concerns the division of qualified personnel to operate a ship continuously. On a typical sea-faring vessel, be it naval or merchant, personnel keep watch on the bridge and over the running machinery. The generic bridge watchstanders are a lookout and an officer or mate who is responsible for the safe navigation of the ship. Safe navigation means keeping the vessel on course and away from dangers as well as collision avoidance from other shipping. An engineering specialist ensures that running machinery continues to operate within tolerances and depending on the vessel, which can also be accomplished from the bridge. A secondary function of watchkeeping is to respond to emergencies on the ship or involving other ships.
https://en.wikipedia.org/wiki/Watchstanding