The Riddle of the Sands (1979)

A lone yachtsman correcting out of date coastline charts in German waters meets up with another ship by chance and develops feelings for the Captain’s daughter (played by Jenny Agutter).
It’s a slow-paced film that was initially bordering on tedious, but it takes a rather dramatic turn into something totally unexpected about halfway through; if you make it that far you’ll be rewarded.
The characters aren't very exciting but that’s part of their makeup.
I can’t say how faithful the cast or the film in general is to Erskine Childers’ source text because I haven’t read it. A reading may well enhance the emotional connection that I lacked.

2½ personal guests out of 5