It will depend on what kind of boat is in the dream as to its interpretation.
A ferry or piloted boat holds all the symbolism of the journey across the river styx after death. Today it signifies the giving up of selfish desires. Having been able to do this, we may be ‘reborn’ into a better life, or way of living.
A small rowing boat would suggest an expedition of emotional discovery but one often undertaken alone.
A yacht might suggest a similar journey done with style, whereas a large ship would suggest creating new horizons but in the company of others. Early seafarers referred to their ships as ‘she’ largely, it is thought, because of the close dependence they had on them for life and because they were difficult to manage. Today ships have lost that personal association. What a boat does in the dream will have relevance as a reflection of our waking life, e.G. Running aground, pulling into harbour etc.
To dream of disembarking indicates the end of a project, successful or otherwise.
If we dream of missing a boat it shows we have not paid enough attention to detail to a project in our waking lives. Also consult the individual entry for boat / ship.... Dream Meanings of Versatile
(1) Because of their connections with water, boats may symbolize (some aspect of) the feminine, either with a plainly sexual reference or with reference to the unconscious (in the case of a male dreamer, the reference may be specifically to the anima), or with reference to mother or Great Mother. See also Mother.
(2) Leaying one’s own shores for a foreign country may symbolize entry into the unconscious insofar as the latter is unknown and frightening - alien, in fact.
(3) If the boat is crossing a narrow stretch of water, it may symbolize death or some other transition: for example, moving from one phase of life to another, or making a new start and a clean break from the past. See also Dead / Death, Ferry.
(4) If in the dream you miss the boat, the meaning would seem to be obvious: you have failed to take advantage of an opportunity that has offered itself - perhaps an opportunity to open new vistas in your life.... A Dictionary of Dream Symbols
You are dreaming about a deep-rooted sense of archetypal power.
The Vikings were a fearsome nation of traders and explorers who crossed the expanse of the Atlantic Ocean and Northern Europe early in the last millennium. We still connect to their powerful mythology led by the Norse god Odin through the collective unconscious. In modern media mythology, Vikings are ferocious warriors and conquerors.
A dream about a Viking is to be calling upon this masculine-principle form of power to enter your life in some circumstance that is asking you to be more decisive and action-oriented.
The most universal image of a Viking for people today is of a rugged sea traveler who is large in stature and strong in every way.
If a Viking character appears in a dream, you may be being called by something from this mythology through the power of the collective.... Complete Dictionary of Dreams