Garmin Navionics Vision+

I fish in southern Louisiana and want satellite imagery and am not concerned with contour map shading. Running a GPSMAP 1042xsv and a GPSMAP 943xsv that will be networked together. Looks like the Garmin Navionics Vision+ is my best option.

Question -
I don’t want to pay for a yearly subscription. And I might like to be able to add additional mapping area after the yearly subscription has expired.

1- Is the SD Card my best option or should I purchase the d/l version?
2- Will the SD Card allow my to d/l additional area after the subscription has expired?
3- Considering the need for satellite mapping, is there other option I should consider?

Thanks in Advance,
Danny

It looks like if the subscription expires on the d/l version that no more map sections can be downloaded. Is this the same with the SD card?

Yes

Following.