Eclipsme wrote:
"Ron Rosenfeld" wrote in message
news
On 16 Feb 2005 17:02:23 -0800, wrote:

this does not look like great news for WAAS or LAAS. where is
WAAS
actually functioning right now? (is there a map of applicable
areas?)
or is it "so much for the heavily advertised WAAS features of the
GNS480"?

WAAS usually covers most of CONUS, southern CANADA, northern Mexico
and
Caribbean islands with accuracy sufficient to provide LPV
approaches.

See http://www.nstb.tc.faa.gov/vpl.html for a map that is updated
every
six
minutes.


Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)

What is the 'vertical protection level' on the map? Is this the
altitude (in
meters!) that waas is guaranteed? If so, it looks like over 120
meters
coverage is everywhere. This can't be, can it? What am I missing?

Harvey


VPL is what the receiver compares against a VAL (alert limit) to
determine whether or not to raise the Integrity flag. The VAL for
LNAV/VNAV and LPV is 50 meters.

Regards,
Jon