A Guy Called Tyketto wrote in
t:

In wanting to find out more about it, I pull it up on
Airnav, and see that Runway 23 has an SDF approach. It looks like
a LOC approach, no OM, MM, IM, or glideslope. So my question is,
what exactly is this type of approach, and how does it differ from
a LOC approach?

The Simplified Directional Facility is similar to a Localizer but may
be offset from the runway and the course may be wider than a Localizer.

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