Mxsmanic writes:

I don't think people are usually worried about being a mile or two off
course enroute.

It's pretty easy to be off by that when using VOR navigation, unless one
is careful. The further away the VOR station, the easier it becomes.

Exactly my point -- the reason for RAIM enroute is not to find out if
you're a mile or two off course, but to have assurance that the GPS is
working. If you have some other means of navigation (looking out the
window, VOR, ADF, etc.) then it's not a big concern; if the GPS is
sole means, you want some way to be sure it's working.


All the best,


David