How often should an alternate fix be taken?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

How often should an alternate fix be taken?

Taking an alternate fix provides a cross-check on your position by using a different data set or method. The idea is to verify that the primary fix is reasonable and to catch misidentifications or instrument errors early. Doing this at every third fix gives a practical balance: you get a regular verification without overloading plotting tasks, and you still have a timely indicator if something has gone wrong. If the alternate fix and the primary fix disagree, you have a clear sign to recheck your bearings, ranges, or plotting. Taking an alternate fix more often would waste time and effort, while doing it only when the master requires could let a sharp error go unnoticed for too long.

Taking an alternate fix provides a cross-check on your position by using a different data set or method. The idea is to verify that the primary fix is reasonable and to catch misidentifications or instrument errors early.

Doing this at every third fix gives a practical balance: you get a regular verification without overloading plotting tasks, and you still have a timely indicator if something has gone wrong. If the alternate fix and the primary fix disagree, you have a clear sign to recheck your bearings, ranges, or plotting.

Taking an alternate fix more often would waste time and effort, while doing it only when the master requires could let a sharp error go unnoticed for too long.

More practice questions