There is an array of electronic devices that can be used in small boats for navigation. until recently, the handheld gps has been our primary choice.. Seaworthy small craft . the bigger the boat, the more seaworthy it is. the natural home of most very small boats is the lake, harbor or sheltered estuary.. Naval architect, mike waters, provides a highly technical review of nine small folding trimarans, including six homebuildables..