USCG Exam PracticeLatitude, longitude, and geographic coordinates
Geographic coordinates published in a 33 CFR Part 100 special local regulation are provided without a NAD 83 label. Which statement correctly describes how a mariner may use those coordinates on a NAD 83 chart?
- ✓ They may be plotted only after applying the appropriate corrections published on that chart.Correct
- B. They may be plotted directly because all federal coordinates default to NAD 83.
- C. They may be plotted directly only if the chart scale is 1:80,000 or smaller.
- D. They may not be used for navigation and must be obtained from the issuing COTP.
Why A is correct
Per 33 CFR §100.01(b), geographic coordinates not expressly labeled NAD 83 may be plotted on a NAD 83-referenced chart only after application of the appropriate corrections published on that particular chart.
Cited:33 CFR §100.01