Years ago my sister told me what a “rutter” was after she had read James Clavell’s Shōgun. A rutter was what the pilots and navigators used as guides as they sailed around the world. Countries such as Portugal guarded these rutters (roteiros) as national secrets to prevent others from finding their trade routes.
Inspired by these rutters (but not by the colonialism that accompanied them), I decided to keep a roteiro for my own journeys. I think in old-timey English this translates to “trip logbook.”