Can not you send us 10m$ from the budget of NASA for let us create a better, true navigation system.
Why?
There are already already very good maps of the earth that were first created centuries ago.
They have been gradually been made more accurate ever since as the countries and continents have been more accurately measured.
And those measurements fit the Globe and not a flat earth.
What is more NASA had nothing to do with that surveying nor with proving there earth to be a Globe.
But since there is now far more accurate mapping of the surface of the Globe from satellites modern maps can now be drawn far more accurately.
But I'll go so far as to say that there never can be an accurate flat earth map.