Belated thanks for a great read. I've just re-read it to refresh my memory. The marine issues were fascinating — use of kit that wasn't even imagined when I was young. I have been on a ship struck (and damaged) by lightning, and although nobody was hurt, the navigation systems & chart room were a total loss. Even the magnetic compasses were out of service. Navigation by plastic sextant, Reed's Nautical Almanac and hand held compasses was challenging!
What I really appreciate is Trevor's imaginative resourcefulness, never rejecting a solution because it hasn't been tried before. I also appreciate the depictions of loyalty between the four friends ~ all for one and one for all.
Finally there is the other major character - Atlantis herself. I remember the early days of cruising catamarans in the 1970s and did not think very much of them, sailing as I did, my great grandfather's gaff ketch built in 1902! Atlantis and her kind are very different — high performance and, with modern materials, far stronger and more powerful.
Paul