Thank you CaptainMusky!This is very helpful

Makes sense. I think the SD card might have a defect…..

Yes! I selected Navionics in Chart Source. That worked fine for a couple of days and then it went black, which is why I wondered if the previous owner cancelled the subscription. Now it sounds more like the SD card might be broken. I presume I will have to get my own subscription? Is it safe to navigate off the Lowrance output only?

Yes! I selected Navionics in Chart Source. That worked fine for a couple of days and then it went black, which is why I wondered if the previous owner cancelled the subscription. Now it sounds more like the SD card might be broken. I presume I will have to get my own subscription? Is it safe to navigate off the Lowrance output only?