gravimetric navigation is used by the Navy on submarines, it’s accuracy and the gravity vector maps are all highly classified but yes it not only is possible it is used on a regular basis presently by our boomer subs.
the theoretical accuracy at part per billion in G is tens of meters if the maps are also made at part per billion resolution. Think Tercom navigation but instead of topography vectors as the truth sources gravity vectors are used with comparable accuracy as a note tercom on our cruise missiles is good to about 200 meters cep. One of my degrees is in Geospatial sciences we have been looking at using gravimetrics in the petroleum industry via airborne sources to do reservoir depletion geocellular gridding.
gravimetric navigation is used by the Navy on submarines, it’s accuracy and the gravity vector maps are all highly classified but yes it not only is possible it is used on a regular basis presently by our boomer subs.
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I learned something new. Thanks.
Submarine navigation is a very complex problem, mostly you are trying to buy down the errors that inevitably accumulate over time in your primary inertial navigation sensors by periodically getting an occasional position fix from some alternative known source that doesn’t force you to surface. Gravity maps plays a role in getting that fix (one method, there are others) and not, to my knowledge, in the primary navigation function itself. But I’ve been known to be wrong.