Re: Safety Question.
The first thing you should do is to look at/listen to multiple weather information sources before you go out. Also make use of a VHF radio with NOAA Weather channels on it, so that you get a warning if the weather picture is starting to go downhill. Getting caught facing a thunderstorm should be an issue of having to dodge an individual T-Storm, not a line of them.
I just bought a new Garmin ETrex for $79. Its a very basic GPS but its very handy. My Midland handheld VHF was about $70, so for about $150 plus tax, I not only know what is going on weather-wise, but can navigate to safety with a great deal of accuracy, and can call for help if I need it. Since I actually participate in SARs occassionaly, hopefully I will not embarrass myself by having to be rescued but I'd rather that than become shark food!
As Boatist says, you don't have to have modern conveniences to navigate a boat, and that includes deviating from a courseline and then ending back on it after the diversion. Power Squadron is great but you can also learn a lot just by going to a library and studying navigation. I can tell you that I once plotted a DR course in a sailboat at night, taking set, drift & leeway into consideration, and actually hit the buoy that was my next waypoint. It was unlit and I didn't see it until it "went bang, bang, bang" down the starboard side of the boat! Mind you, I probably couldn't do that again in three lifetimes but it was definately one of those "gee, this stuff works" moments!
Education is your friend!