Or use landmarks.  After you get north of Seoul you'll see a big river that abruptly ends.  The battle is right near where it ends.    You will see a fire and a column of smoke to mark the place once you get within about 15 miles of it.  Fly to the smoke.

Using the ADF is easy.  It's like an AM radio, tune it to the frequency of the one you want to fly to and fly in the direction the arrow points until it reverses when you fly over it. In the case of older types like in the F-86, fly so that the arrow points to zero.  The only problem is that the transmitters are low frequency and not as strong as VORs so they only broadcast about 30-40 miles.

Dutch