Nice boat. I used to have Catalina 30 and loved it. Take a look at the Garmin GPSMap 545 Chartplotter (or go big with the 4208). The 545 has an internal antenna and their user interface is very easy to use. No need to buy seperate charting chips, all of the charts you need come pre-loaded. Optionally, they have an advanced g2 Vision chip that has some really cool features. I bought Garmin 4212 this year and was previously a Simrad (CX34) and Raymarine (C80) customer. I was happy with Simrad and Raymarine, but I like my new Garmin the best.