"Harlo Peterson" wrote in message
...
"Gary Drescher" wrote in message
...
Whatever shortcuts pilots may take, the fact remains that the NACO timing
tables do use GS, just as the Jepp tables do. If wind is negligible and
CAS is close to IAS, then of course IAS closely approximates GS,

Only for sea level airports. You will be off by about 20% landing at a
6000msl airport.

Yup, density altitude is a factor too; my flatlander assumptions were
showing. But even at 6000', the discrepancy is less than 10%, not 20%.
Still, you're right that the discrepancy is large enough to matter.

--Gary