Any sea unit can move into a friendly sea zone during the non-combat phase regardless of when the sea zone became a friendly territory on the map. It doesn't matter what was there before the combat phase of your turn.
Don't be confused because of the combat movement rule for air units rule that states:
A&A:AE Rulebook wrote:
An air unit that moves in (the combat) phase must reserve part of its move value for the Noncombat Move phase, at which point it must return to a safe landing spot using its remaining move. An air unit’s movement in any complete turn is limited to its total move value...An air unit must end its move (during noncombat) in an eligible landing space. Bombers and fighters may land in any territory that was friendly at the start of your turn.
An air unit must to land in a territory that was friendly at the beginning of a turn. These movement rules don't apply to land or sea units; they can go into any friendly territory during noncombat movement regardless of when the territory became friendly.