E.F. Knight chose a very effective writing style, stuck with it and ended up with quite a readable travel narrative. The book, The Falcon on the Baltic, isn't widely available and you might want to try reading it online (and here). His was a simple goal, a summer's cruise in the Baltic. That's it.
He writes very well and makes all his stops interesting to the reader, even when the harbor or city or canal wasn't very enjoyable.
I have attempted to collect some of the placenames from his book into a Google Map and also as a Google Earth KML file. They are, by no means, authoritative. Nor are they even in order. I may yet get to improving them over the holidays.