Maybe this is a dumb question but hopefully one of you can help me out. I have a 2016 SV with the radio that includes XM. It has the backup camera but not navigation. It seems to only have 6 presets stations for XM. I get 18 for FM. Is this correct or is there a way to get more presets for XM. It displays as XM1 so I would expect someway to get XM2 and XM3. Thanks.