english or English speaking boat mechanics are like gold dust over here....we have used spanish mechanics on our boat for a few years now, but everytime they do something, we always have to call them back to put job right....lately, they cant even seem to do a simple service right. ( Don't get me wrong, but i am sure there are reliable spanish mechanics out there, it's just we cant seem to find them.)
SO, a MOBILE boat mechanic may well be a god send.
good luck what ever you choose to do.