Paul,
I have a Gen 1 HDS 7 Basemap. I bought a Platinum West chip for it. From my garage, I selected "Navionics", selected lakes, and I got a list of all the lakes within about 35 miles from my house and no others. The list began with the lake closest to my location and after 35 miles, nothing. The lake list for the Platinum West is in the thousands. Am I missing a prompt or setting to get the other lakes to show up? Do I need to register the chip first? I just opened the package and plugged it in after I got it. I've never used a mapping system before. Thanks for any help ! Scott