169. How is variation indicated on a small-scale nautical chart? ______
举一反三
- 170. Which information does the outer ring of a compass rose on a nautical chart provide? ______
- Which information is found in the chart title ______. A: Chart number B: Chart sounding datum C: Revision and edition date D: Variation information
- The development of ___ led to the fully automatic ARPA systems installed on commercial ships. A: Sea Talk B: powerful microprocessors and mega memory capacity C: chart plotte D: small-scale chart
- Isogonic lines are lines on a chart indicating （）. A: points of equal variation B: points of zero variation C: the magnetic latitude D: magnetic di
- 49. A chart with a scale of 1:80，000 would fall into the category of a ______.