The classic dual TFG configuration offers several attractive features such as angular gain close to the maximal theoretical value of 1, increased modal mass and drive mode amplitude, and low dissipation of energy (Q>1e5,τ>1 second), Table I. However, the technology appears to have reached its fundamental limitation with bias uncertainty on the order of 1- 10 deg/hr. Reduction of bias drift by 2-3 orders of magnitude would be necessary for these devices to approacgyrocompassing and navigation grade performance, which is highly unlikely, if not fundamentally impossible, with these mature architectures