I prepared some own POis with digger on my PC Win 10 and imported them to the Navigator data folder in a folder named import. POIs were visible and could be searched in Navigator. Transfered to a Samsung S5 with Android 6 it worked fine also. The same with a Lenovo TAB4 with Android 7.1.1. Transfering the data to a Samsung S7 with Android 7.0 did not show any icon in any zoomlevel nor was ist searchable. The import was not vsible in the search routine.
that is what I tried before. I did it again, but it did not help. In the other systems it works in .......data>import could it be that the problem lies in Android version 7.0. It works in Verion 7.1.1
Can you try it in internal storage? It can be connected with sd card access - files downloaded into data folder using navigator works, sideloaded does not. I cannot explain you why exactly this happens but we had already one case like this (if it is source of your problem)
It seams that it is not possible to change the storage for the Navigator installation to an externel SD-Card. Neither with Android APP tool nor with the Navigator moving tool. Whenever you start Navigator and go to the changemenu you will find an installation in the internal SD-Card. Switching to external SD only copies the mapdata and every start of Navigator uses the map-installation on the internal memory. Deleting the data in the internal memory causes Navigator to crash. This happens with Navigator installation on internal and external SD. Due to the intensiv memory consumation of the Navigator maps stuorage on external SD is essentuel.
Now the POIs are visible. I found some well hidden leftover Navigatorfiles in the internal storage. After deletion of the files Navigator shows POIs as planned.
Thanks. The mentioned I do not need, 6 in total are ok for me. In worst case I could combine two ore three lists to one. I only have to fine out how I can give every part an own Icon in digger.