I didn't point out jet stream knowledge as an example of penny knowledge did I?
Btw - define "general knowledge".

What do I want to know about ILSs or Rho Thetas? Well right now I'm struggling with understanding when to apply the flight inspection tolerances to localizer course width and glide slope angle measurements vice maintenance reference (initial) tolerances and remembering the numbers for Equality in Normal between a dual transmitter (non-USAF facility) is driving me insane! I don't feel like I've ever had such a hard time remembering a set of numbers. On Rho Thetas, do I have to apply the 1 degree tolerance of the Airborne Reference Radial during the alignment orbit to the last reported alignment average of the orbit itself or do I use the regular 2.5 degrees of alignment?

USMCFLYR

Note: None of this penny knowledge (to an airline pilot) will make a bit of difference of how well s/he executes the approach down to mins on that ILS, and I don't need to know the inner workings of my inverter either. It does what it is suppose to do. If it fails - I switch to inverter #2. If it goes further than that I do some of that pilot 'stuff' and get the plane on deck safely.