I am looking to purchase a depth finder / GPS combo. Have it narrowed down to two units; Garmin 441s and Humminbird 385ci. I've looked at both and could go with either one. My question pertains to the basemaps that are pre installed in each unit. Seems like the Humminbird has much less info than the Garmin and I would have to buy a Navionics card right from the start. The Garmin appears to have a more complete pre-installed basemap, which includes much more detail, nav aids, etc. No need to buy an additional card for now. If I'm right, the plain Garmin and the Humminbird plus coastal Navionics card will end up costing about the same $. I'm suffering from information overload. Thanks up front for your thoughts on this.