Chartselect? Anyone ever get a specific lake?

Looks like I can download a specific lake or chain for lakemaster through Chartselect vs. buying the entire chip.  $10 for my chain and $5 extra for its “smart strike” layer.  Anyone ever do this to upgrade their base Humminbird map?

 I have a couple Lakemaster chips, gotta have one in each unit.  I have downloaded a couple of individual lakes onto my phone.  I iike to research certain lakes before I go there.