The author has many other similar trip reports on his home page at https://timonoko.github.io/ https://timonoko.github.io/. In the 1992 report (in Finnish) he a

The author has many other similar trip reports on his home page at https://timonoko.github.io/ https://timonoko.github.io/. In the 1992 report (in Finnish) he already says that the tide chart and vhf radio are must haves. At least he wasn't too stubborn.