Doug, I have a Garmin nuvi 52LM. I even bought an SD card with Mexico maps before moving here 3 years ago. Next time you come into the city, if you want to swing by or meet somewhere, you can have it for free. Here in the city Google Maps or Waze is much more useful because of the traffic, so we just use our phones.

I live in Zapopan right next to Plaza del Sol.

The suction cup to attach it to the windshield has lost its mojo, so you'd need a new one.

EDIT: I think I'm going to be dropping someone at the airport on Monday around noon, but don't have any plans currently that will take me any closer to the lake.