Roy Smith wrote:

wrote:
And, your reference that the speeds on NACO charts are ground speeds?

Oh, come on, this is getting silly. The table is labeled (for example, on
the HPN NDB 16) "FAF to MAP 4.8 NM". That's one point on the ground to
another point on the ground. The times in the table tell you how long it
will take to cover that distance at various speeds. What else could the
speeds possibly mean if not ground speed?

Most everything pertaining to instrument procedures is predicated on fixes,
facilities or waypoints either on the ground or geo-referenced to a precise
location on the ground. Yet, many (most) of these procedures are predicated on
indicated airspeed.

The origin of the timing table was not specifically referenced to ground
speed. In fact, the KISS concept in pre-GPS days favored simply applying IAS
on final, as in managing human factors and keeping the priority tasks at the
top of the list, so to speak. So, the discussion is not silly at all.