There are not. Modern Strapdown-based inertial estimators rely heavily on GNSS; if you want something that won’t become unusable after a few minutes then you ne

There are not. Modern Strapdown-based inertial estimators rely heavily on GNSS; if you want something that won’t become unusable after a few minutes then you need significantly better sensors. LORAN is an alternative terrestrial system, but to nowhere near the scale of modern GNSS.