Plain English Meaning

A label showing that an approach can be flown using satellite navigation (GPS) or by tracking a ground radio beacon (NDB). Either method gets you to the same runway, but GPS is more accurate and is what most pilots use today.

Full Definition

A combined notation used on instrument approach charts and in flight planning to indicate an approach or navigation procedure that may be flown using either GPS guidance or guidance from a ground-based Non-Directional Beacon. GPS is a satellite-based navigation system that provides precise position information worldwide. An NDB is a low or medium frequency ground transmitter that broadcasts a non-directional signal an 's () uses to toward the . When an approach is published as GPS/NDB, a suitably equipped aircraft may use GPS in lieu of the NDB to fly the procedure.