Thank you very much Neil and tom1807. I simply overlooked the naming of the file. On both devices the map has to be named 'gmapsupp.img' to be read. All features of TCN 2013.30 work on the Nuvi 200. However, the search function function ('search near.....') doesn't work on the Kenwood DNX7340BT. I had that before with several other map versions but not with version TCN 2013.20. It has to do with a bug in the device's software. The software is dated 7 April 2011 and won't be updated it seems. The problem with the search function on the Kenwood is that the software requires you to select a province and then a city in the selected province before you can search for POIs. It can't find any cities in the province! Again, this does work on version TCN 2013.20.

Anyways, thanks again.