Outer marker
From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
The outer marker is a location off a battlestar where pilots are to await docking instructions, which prevents congestion and any docking conflicts with other inbound craft (TOS: "Lost Planet of the Gods, Part I").
Presumably, the outer marker is located outside of the approach path for other ships as well as a direct path to the landing bay. Fighter craft and shuttles typically land one at a time (Saga of a Star World, et al).