Query: Garmin Mapsource & POI Loader

I am trying to transfer two sets of POIs onto the SD card from my Kenwood DNX7034BTNAV Head unit. It uses the Garmin navigation engine.

One set of POIs comes from my Nuvi 660. They are POIs that I have loaded when actually at that location.

The other POIs are the Camps4 POIs which are in a combination of .csv and .bmp files. I have successfully loaded these onto my Nuvi in the past using POI Loader.

I can get these onto the SD card using POI Loader but when I go to Mapsource to load my Custom POIs it overwrites the POIs that were loaded first.

POI Loader says I can transfer the Camps POIs into Mapsource but when the process is complete I can't find them, or they are not recognised as a format that Mapsource can use.

Frustrating, to say the least.

Basically I want to put 2 different sets of POIs onto an SD card without overwriting (and thus removing) any existing POIs. I can do each process separately but then the first lot is removed.

Can anyone shed some light?

If the answer is lengthy please MM me for my email address.

cheers