Does anyone know if the rns 310 have dab radio? If not can it be programmed 

Please someone correct me if I'm wrong here, you can get a Dab version of the RNS315+ Amundsen. It cannot be coded to an existing unit, alternatively you can have an aftermarket (non skoda) Pure Highway installed

There was a discussion in 2012 regarding DAB not being fitted to 310 models and why Skoda were not fitting them to cars in some markets. 

https://www.briskoda.net/forums/topic/253495-amundsen-dab/