Absolutely right, thank you for your patience. "2) edit the Exec= line in the file /usr/share/dbus-1/services/com.nokia.navicore.services to be Exec=/home/user/navistart" No problem with editing the file, just a big problem saving it. Pemission denied. I can't see an easy way in emelFM2 to change pemission to 'user'. I have tried to use Xterminal, become root, and then change pemission for the file.
cd /usr/share/dbus-1/services mv com.nokia.navicore.service com.nokia.navicore.service.bak cat > com.nokia.navicore.service <<EOF [D-BUS Service] Name=com.nokia.navicore Exec=/home/user/navistart EOF