Radar is a funny thing. Once you get used to it, you'll never want to be without. As for illimination, what model do you have. I have an old CRT Furuno, and you use the BRILL button to change to brightness of the display.
I don;t use mine in the bay often, bad weather or low llight, but it is on every trip in the ocean. Use it to spy other boats that may be around, especially wreck fishing. I can tell if someone is on my wreck, allowing me to change course and head somewhere else. If trolling, and I see a knot of boats working a smsll area fives miles away...there is usually a reason :). Tracking storms is another big plus. Lots of uses but these are the most common for me.
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