Thank you for the reply. I am starting to understand that the Navionics+ card is separate from the GPS waypoints on the unit. My Helix only has 1 SD card slot...can I remove the Navionics, import waypoints from a separate SD card to the unit, then put the Navionics card back in and still see the waypoints...? Feel like I may be overthinking this....might be simpler to just get an AC/DC adapter to bring the unit inside to scout areas and set waypoints