Tlewis95 wrote:
Im new to IFR and was wondering what an SDF approach is.

Thanks!

The AIM is your friend. If you are a pilot, you should have one.
It's in chapter 1-1-10. A SDF (Simplified Directional
Facility) essentially a localizer type facility but it has a wider
(6 or 12 degree) course width. It also might not be aligned with
the runway. I can't recall ever actually seeing one in real life,
but I'm sure people will pipe up with their favorites.

This is different from an LDA, which is a localizer that just isn't
aligned with a runway. We've got an LDA here into National Airport.
It even has a glide slope, it just doesn't take you anywhere near
the airport.