Thread: VUS020R BlueChart g2 Vision St. Lawrence Seaway up to v2015.5 v.17.00

I love this mapset, but recently I realized I'm having a glitch using it. I unlocked with gingunlock, followed all instructions and all seemed fine. I used it on my 521S for a a few weeks before I put 2+2 together that my Garmin depth readings were freezing way too often, requiring me to reset. I originally thought it was my unit's data cord and blamed it on that. So I replaced the cord, still froze....then I put my original purchased Garmin Inland Lakes NE card back into the 521S and no freezing at all. Did I do something wrong or have others experienced this? I am new at this, so it could definitely be my fault. Just looking for answers since I really want to go back to this mapset