The accident, possibly caused by strong waves on the high seas, has forced the vessel to divert its trajectory and seek refuge in Vigo's wharf for Transatlantic liners at 8:15 p.m.
Despite sailing with about 5,000 people onboard, including passengers and crew, no injuries or serious damage has been reported.
The 311-meter-long mega liner is one of the world's largest and common in the port of Vigo. It had already visited the port this month and has scheduled another stop on November 3.
At the time of accident, Navigator of the Seas was sailing on a 10-day "Sunshine In The Canaries" cruise roundtrip from Southampton UK.
For other Navigator of the Seas accidents and incidents see at the ship's CruiseMinus page.