rose des vents, compass card, or mariner's card

6. n'ait reçu; a statement of doubt, if négative, requires in the following subordinate clause ne with the subjunctive. This is an idiomatic use of ne; in English no négative appears in the second clause.

Page 47. — i. seraient; in stating conclusions based upon a given theory or assumption, the conditional frequently occurs where in English the présent tense is preferred.