Andrew Sarangan wrote
What exactly is a Fan Marker? See SDF10 @ DWU. How is this different
from an OM? The fan marker seems to have its own identifier code.

Ah yes...the SDF RW10 at DWU...my home field for 7 years.
Probably did the SDF approach at least one hundred times.
Positioning wise, the fan marker does not fit the usual
requirement for outer/middle/inner markers. At DWU, it
marks a step-down fix after that last radio tower where,
if received, one may descend to the lower FM minimums.
Andrew, you probably don't remember "bone" markers either?
:-)

Bob Moore