In article 004101c6ce26$e77966d0$4001a8c0@omnibook6100,
"Jim Carter" wrote:

Not having flown an EFIS or EFMS myself, I'm not sure of the "into
position checklist items". For example, in a standard steam-gauge panel
one of the last things we check is to align the directional gyro with
the runway heading and compass. With an EFIS or EFMS, is there any such
last minute check, or is the heading assumed to be correct because it
was aligned by the GPS when the bird came out of the chocks?

No, the GPS doesn't align the heading gyro -- an electronic flux gate
does. There are two independent heading gyros, and two independent flux
gates to set them. If there's a disagreement of more than a few
degrees, an error flag will come up, and the crew will troubleshoot to
see where the error lies.

So yes, on that type of system, the heading is assumed to be correct.
The odds of both flux gates failing at exactly the same time, but to
exactly the same erroneous heading, are about nil.