You don't need much acuracy to find an airport. They tend to be the
large things with the long areas of pavement. As of today, the use of
GPS as sole naviation for preceision approachs in low visibility (fog)
is limited to "non precision" approaches, just good enough to get you
down to about 500 feet and near the end of the runway. At some point it
should be good enough to actually touch down on the runway with (LAAS).

-Robert


wrote:
As part of my work (civil engineer), I routinely use GPS equipment in
surveying. And construction specifications usually calls for this
equipment to be held stationary for as much as three hours where
crucial transition points are to be located, and for up to twenty
minutes at less important locations.

I guess since you folk use GPS to navigate all across the globe and
requires to be both very precise and instantaneous, my equipment is
very much inferior to what's used in aviation.

Has anyone here used the type of equipment I'm mentioning? You should
see the time the thing I use takes to stabilize itself to show the
elevation... you'd comfortably CFIT if you had that in your airplane
)

Ramapriya