I am told that I have a navigation reader in my car with a disc in it. My sat nav works ok but needs updating. I cannot find the disc reader. I was told to look in the boot, under a seat or in the glove box. But nothing. It does have a cd/ dvd player but that is not it (I don't think). It also has a slot for an SD card that is empty. My car is a 2011 Legacy.