Roger’s Runway: Answering WAAS Questions
Recently there was a comment on a post asking for clarification about WAAS
approaches. The question, “How can a pilot determine from an approach
plate if an LNAV GPS approach will offer the LNAV+V option?” can
quickly be answered by saying there is not true way to determine this
yet.
There are several factors that have to be first be considered.
First, the most important part is positional accuracy. If the
positional accuracy is good enough, you can receive the +V option on a
LNAV approach. If for some reason the GPS/WAAS signal is not accurate
enough, you will only get a LNAV approach annunciation. The second
factor in getting the +V option is the databases. The electronic
databases are easier to change and update than the paper charts. It is
possible for the electronic database to have a +V coding, and the paper
chart, while still current and accurate, won’t have the “>”
symbol on the chart. With each cycle of new paper charts, the lack of
a “>” will slowly start to disappear and you will be able to
determine if you get +V on an LNAV approach. I have included a NOAA
chart and Jeppesen chart to show how a LNAV+V
approach will show in the chart. The angle of the glidslope is
highlighted in red.
The post Roger’s Runway: Answering WAAS Questions appeared first on Garmin Blog.
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