(*) A special naval chart, at a scale of 1:50,000 or larger (preferably 1:25,000 or larger) designed for planning and executing mine warfare operations, either based on an existing standard nautical chart, or produced to special specifications.
MINE WARFARE CHART
Meaning of MINE WARFARE CHART in English
DOD English dictionary of military terms. Английский словарь военных терминов DOD. 2012