'On the lee beam' definitions:

Definition of 'On the lee beam'

From: GCIDE

Lee \Lee\, a. (Naut.) Of or pertaining to the part or side opposite to that against which the wind blows; -- opposed to weather; as, the lee side or lee rail of a vessel. [1913 Webster]
Lee gauge. See Gauge, n. (Naut.)
Lee shore, the shore on the lee side of a vessel.
Lee tide, a tide running in the same direction that the wind blows.
On the lee beam, directly to the leeward; in a line at right angles to the length of the vessel and to the leeward. [1913 Webster] Leeangle