welliewangler errr yes, you'll need accelerometers as well. On a per axis basis a single integration WRT gives you velocity and a second integration gives you displacement. And as a matter of point, all RLGs and FOGs are essentially rate gyros also.
What really is fascinating is that the Honeywell ADIRU fitted to the Boeing 777 has the equivalent integrity of a triple IRS but instead of using 9 RLGs and accelerometers it has only 6 of each. The integrity comes from having non-orthogonal axis', so in theory even the loss of more than one axis has no operational effect. Amazes the hell out of me.
Dude
