X Marks the Spot

a number of times in this episode the location: 140 degree latitude and 10 degrees longitude.

I think this has been reversed as latitude doesn't go higher than 90 degrees.

the north pole is 90 degrees north latitude for example. The equator is zero.

I THINK , therefore, they meant to say: 140 degrees longitude and 10 degrees north latitude.

despite this, I did enjoy the episode.

also the plane in question, at least as it goes away is a B45 Tornado, one of the earliest jet bombers of the USAF and also used a Recon plane.

remember latitude is like a ladder that you climb north or south of the equator

longitude is the LONG lines on the globe starting at zero which runs through Greenwich England, the PRIME meridian of Longitude!