Editing Set and drift (section)

== Tools used to calculate ==
To use Navigation Triangles, a navigator need two of them to be able to navigate correctly. Navigation Triangles can be used to find [[Position line|Lines of Positions]], Dead Reckoning, [[Ranges-Navigation Aids|ranges]], Estimated Positions, Running Fixes and so on. They are also used to connect all the types of fixes to be able to determine a [[course (navigation)|course]].<ref>{{Cite web|url=https://www.garykessler.net/scuba/library/Charts_Navigation.pdf|archive-url=https://web.archive.org/web/20170918024433/https://www.garykessler.net/scuba/library/Charts_Navigation.pdf|url-status=dead|archive-date=18 September 2017|title=A Short Course on Nautical Charts and Basic Plotting For the Recreational Boater|last=Kessler|first=Gary|date=4 November 2016|series=Version 3.4}}</ref>

Dividers can be used for the measurement of lengths of lines on a chart and approximating the lengths of non-linear lines on a chart. Dividers can also be turned into a [[Compass-and-straightedge construction|compass]] by replacing the metal leg of the divider with a piece of lead. A compass can measure and draw arc and circles on charts and maneuvering boards.