On a sectional chart, around cities, are yellow areas.
What are they?

Places they are too lazy to chart.

Actually, it's only half faceitous - in the yellow areas they do not
chart =anything= (except for a few towers), which makes it hard to use
for navigation. Even roads (which would be =excellent= landmarks at
night) are omitted.

/grouse

Jose
(r.a.student cut, as I don't follow that group)
--
My other car is up my nose.
for Email, make the obvious change in the address.