I need to transfer aprox 700 MX googlemap entries from old db to new. I have tried ajw-export/Datagrab but it does not transfer the geodata.
You could use Google Maps for EE to do this, but you would need a .csv to do it. It comes with a geocoder/import utility that is really robust and will work for almost all data files. I know it's not for MX Google Maps, but this could save you quite a bit of time by not having to roll out a custom solution.