The ginger cookies seemed to work, the boy did a few hour sail with no problem this last weekend. Even when we had to run the diesel, fumes did not seemed to cause trouble. Fed him the ginger cookies on land a few hours before leaving on boat, and also during the trip. Seemed to do the trick. Also gave him some unsalted soda crackers and guava juice during the sail- as he requested. The boy says he is ready for an overnight this weekend. The boy does not like ginger snaps, and the only other ginger cookies I could find were some made here in Hawaii (I will post company name when I take a look at the package again as they are actually pretty good) The cookies where more like a cracker but had a sprinkle of sugar which to the edge of the spice.
Thanks for the sugestions.