I knew you were the technical type
.
Looking for some tutorial on warbird navigation during WW2, I found this site. Most of it is for the anal retentive type like me, except item 81 which is for the CTRL-E crowd as well.
Item 81 is not only a lovely thing to look at (does the name Vargas ring a bell ?) there is also some interesting stuff to read. Hump may have different meaning there.

Looking for some tutorial on warbird navigation during WW2, I found this site. Most of it is for the anal retentive type like me, except item 81 which is for the CTRL-E crowd as well.
Item 81 is not only a lovely thing to look at (does the name Vargas ring a bell ?) there is also some interesting stuff to read. Hump may have different meaning there.