With a coastal cruiser like the
Catalina 30, I would agree with everyone else, an
autopilot would be more helpful than
windvane. For distance cruising autopilots have the liability of increasing
fuel consumption because they require extra
charging time to keep the
batteries up. Since you are only short hopping, the windvane and a high output
alternator should hold you in good stead.
For longer distance
offshore cruising, a windvane (and a more appropriate boat) would make more sense as it allows you to minimize
fuel usage on a long
passage thereby maintaining a reserve for light air, entering harbors, etc.
Jeff