Navigation. Where are you?
Aerial Navigation
Where are we/you?
Presumably we aviators base all of our increasingly precise navigation on the planet's datum at Greenwich on the zero meridian. Presumably also we will continue to use that point at Greenwich as our datum even though it is itself slowly moving NE at about 30 mm per year.
Problem is that tectonic plate movements will increasingly move all of our known locations every which way relative to our declared datum.
I guess we will or have decided to keep the zero lattitude fixed relative to the axis of the planet.
So how far has our Greenwich Datum moved from its original location since it was established ? Perhaps no one knows or yet cares.
If the positions of the GPS sattelites are all Greenwich based and our receivers increase in accuracy then shouldn't we start to see maps and charts denoting positional drift as is done for magnetic variation ?
Does anyone know whether ICAO or whoever has a handle on the mounting navigational inaccuracies ?