grid heading

grid heading

[′grid ¦hed·iŋ]
(navigation)
In grid navigation, the heading relative to grid north.

grid heading

An aircraft heading measured relative to grid north. See grid direction.
References in periodicals archive ?
Ferrari left Renault trailing in the United States with a one-two but Schumacher concedes that result is not a fair reflection of the grid heading to Magny-Cours.
Now Button is worried he could be trapped behind the slow starting Ferrari, which sits immediately in front of him on the grid heading into this morning's final qualifying.