This example shows the 4 NDBs known as 'Oksywie', located near Gdynia. The inner pair of NDBs (NW, NO) works on 290 kHz, the outer pair (NOW, NWO) works on 494 kHz.
In this listing, the paired NDBs according to the definition given above are considered by me as the 'same' NDB, even if it is a pair of 2 different NDBs being close to each other. But except for special reasons, there is always only one of them on the air.
(the picture on the left was prepared with the help of GoogleEarth, and the KMZ file of NDB locations contained in the digital version of Michael Oexners NDB handbook)
