From Middle French routier, corresponding to route + -ier.
Meanings
(historical) A set of instructions for navigating a course at sea; a pilot's book or seaman's guide.
But a rutter was only as good as the pilot who wrote it, the scribe who hand-copied it, the very rare printer who printed it, or the scholar who translated it. 1975, James Clavell, Shōgun, Random House, published 2009, page 13:
Forms
Spelling
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Source
rutters
Number=Plur
lexicographic
Translations (4)
fi reittiopas (a pilot book) · fr routier (a pilot book) · pl książka z instrukcjami (a pilot book) · nl logboek or scheepsjournaal (a pilot book)