navigable semicircle

noun

, Nautical.

1. the less violent half of a cyclone; the half blowing in the direction opposite to that in which the cyclone is moving and in which a vessel can run before the wind.

Example Sentences

Left or navigable semicircle,—Steam and sailing vessels: Bring the wind on the starboard quarter, note the course and hold it.

From Project Gutenberg

The ship a has the wind at east-northeast; she is to the left of the storm track, or technically in the navigable semicircle.

From Project Gutenberg