May as well jump on the bandwagon. The #60 size low angle block planes are a versatile and handy block plane to have.
Good quality examples are made by Veritas and Lie-Nielsen among some others. My LN #60 is a nice plane but it a bit on the heavy side compared to my Stanley's of the same size.
My boat building knowledge is next to zilch. If he is interested in making a lapstrake boat a rabbet plane my be in order if those use shiplap joinery.
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jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)