It might not go to fast but the small sailboat worked perfect for me, so you still can move from Yland to Yland, I took a seed box with me to take a much a possible seeds with me I was missing, and placed a few chest on (the small) deck for "big recourses". Might not be the fastest way but you still can move around.
And @Aleš Ulm I am definitely looking forward a "developer branch" for Ylands as for ARMA3 /DayZ it always have given good feedback, even...