At the moment I'm preparing the files for a Kindle e-book version. If all goes to plan it will be available in colour for ipad users and monochrome for Kindle users at about US$10. The conversion of the files to work well in Kindle will cost about as much as all the royalties earned so far on the print run....
I've had this Navigator pic for a long time, but can't find attribution for it, so it wasn't included in the book. Owen Sinclair has since kindly told me that the boat is Nigel McCarters, taken at Lake Taupo NZ . Thanks Owen, it is an iconic pic I think.