I did an experiment last week that should have been able to measure differences in gravity. No differences were detectable. This does not give confidence in the cosmology that we learned in school. It indicates that the concept of gravity we have learned may be a hoax.
There was no difference in gravity between Nashoba and Hennepin. The map indicated there should have been a difference of .006 g for the steel weight and .009 for the rubber. The most conservative conclusion is that the map was created according to theory, not measurements of gravity. There are other possible conclusions that are far more disturbing.