Google Earth User Guide - Manual (Page 100)

Oblique Mercator (Hotine) A
cylindrical
projection
like the
Mercator
projections,
but where
the cylinder
is shifted to
align with a
region that
is oblique
and follows
neither a
north-south
nor an east-
west axis.
The region
to be
mapped
typically is
a small
portion
along the
length of
the
meridian
and close
to it
laterally.
For
example,
this
projection
was
developed
originally
for
mapping
the
Malaysian
peninsula.
Chamberlin Trimetric Used by
the
National
Geographic
Society for
mapping
most
continents.
This
projection
is a three-
point
equidistant
one,