I have a recently purchased Helix 7, chart, SI DI unit that runs in conjunction with the i pilot link system and that works fine. I purchased the Lake Master card for my area but the unit doesn't respond to the card at all when I place it in the slot. I'm doing the physical install correctly. I have looked up a few discussions and determined that the Helix model is compatable with the particular card i bought. This unit has only one card slot. Anyone out there dealt with this issue?