Dec (unit)
The dec is an obsolete and unlawful unit of flat angle that was used to estimate another ship's course as a deviation from bank angle .
1 Dec = 90 ° / 9 = 10 °
literature
- Peter Kurzweil: The Vieweg unit lexicon. Vieweg, Braunschweig / Wiesbaden 2000, ISBN 978-3528069872 .