Is is possible to use indoor location with no internet connection at all. Possibility to save Location and beacons etc locally to be able to navigate/show where you are?
Yup! You can use the Location Builder to generate a floor plan entirely on the device.
Just follow this guide:
http://developer.estimote.com/indoor/map-your-location/#the-advanced-way-location-builder
… and simply skip the last step, “uploading to Estimote Cloud”, and instead, you can use the “location” object directly to start position updates.