Spunky,
If you're going to hire a boat electrician to install a GPS chart plotter and radar, then I recommend the guy who has done all the work and excellent work on C-Pup. He was at my house today installing a new stereo and a 2nd 12v outlet on the transom for squid lights or a handheld flood light. He said he'd drive to Costa Mesa to work on Spunky in your driveway. He charges $80 an hour plus incidental wire and parts. You buy the units. I recommend a pivoting stand to hold the GPS and sonar unit bracket. You'd have to buy the pivot stand separately.
A key to safety at sea is quality stuff and duality or back up. I have two identical Lowrance units that are combo (split screen) chart plotter and sonar~ fish finders. I only have a "need" for one of the units running on split screen. I prefer two however, running one just for the chart plotter and the other for the fish-finder sonar, but their use is interchangeable. (I can also run both on sonar, one @ 50 and the other @ 200.)
If the one set to navigation blows, then I can use the other to navagate home. I learned this the hard way when I had just one unit. It blew out when I was fishing Farnsworth Bank on Catalina's back side. Fortunately, it was a bright sunny day and calm sea, so I had no problem returning to Cat Harbor by sight navigation. Had there been fog or were it at night, I'd be lost at sea. I also carrry a back-up GPS antenna on suction cup, and a hand held battery operated GPS device in my ditch bag.
My boat VHF radio is connected to the Lowrance unit so that the Lowrance tells the radio my current lat and long position. In an emergency, I can transmit a digital coded SOS message that includes my lat and long position by pushing a red buttonn on my radio. You need to register and get a MMSI number... do that easily and for free through the Boat U.S. web site.
Other dualities on C-Pup are two fire extinguishers, a hand held radio to back up the installed radio two anchors and line (I keep thenmm spooled on plastic electrician extension cord reels) , and so on.
A radar, besides tagging ships in the fog or at night, is also able to profile a distant shoreline or island to confirm my sense of direction or guide me if myGPS units both break. It also tags channel buoys.
Of course, there is alway the compass and paper chart... or should be for traditional navigation as a back up to boat electronics. The compass has to be set properly or it will be worse than nothing. (Magnetic north is not true north.) Contact a yacht club or Coast Guard Auxiliary to find a professional compass setter, or do it yourself if you're able.
In Marina del Rey, there is a buoy a couple huundred yards from a shore a sign that says "North", which I think is magnetic north (I had better be sure!)Line the boat up at the buoy and adjust the compas so north is in the direction of the sign. Problem is, it's a very old sign (often hidden by tree branches). Most marina's have such a marker for setting a compass. The deviation of magnetic from true however, sometimes changes over the years. Best idea is to have a licensed, professional compass guy set your compass. Another reason is because boat electronics and motor pulse might disrupt its operation, depending on its location in the boat and what's running. He may tell you =you must move the compass locaiton in the boat.
I hope you're getting the idea about safe boat navigation, whether at night, in og or on a perfectly nice day that later turns against you... In three years, I went from zerio knowledge and maximum stupidity to serving as the Santa Monica Bay Coast Guard Auxiliary Staff Officer for Member Training. You can get ahead of the curve. You just need to know there is a learning curve and focus on that.
A good friend of mine in Huntington Beach, Mr. Jeff Spira, published a nice booklet on Seamanship and Coastal Navigation. I recommend it. It's an easier read and quicker to lean than a classroom course on the subject, although I recommend classroom courses as follow-up. Jeff also published two great books, one on fishing the SoCal coast, and the other on diving wrecks in California. I think you'd like those too.
See:
http://www.spirainternational.com/hp_book.html
Here's the boat electrician I recommend to you:
Robert Holder, Marine Electrician
P.O. Box 9447
Marina del Rey, CA 90295
Cell PH# 310-346-3926
Be well,
Keith
C-Pup