Hang on, you started this thread seeking elementary advice on the need for a radar, next you posted some misleading doubts about the utility of AIS for your proposed ventures and now you present yourself as a yachting Bear Grylls of the English Channel.I started sailing round the CI over 40 years ago without any significant electronic aids - that is when I wasn't too busy with RORC races, ton cups, Coaching and other things.
Your 2018 season voyaging plans sound sensible and your now excellently fitted yacht is well up to the task without radar. All these anxieties about the perfect equipment mix will fade away as soon as you get out there and strut your stuff beyond Portland Bill. If however lack of radar keeps you in port then fit the extra gadget and cast off. This debate is similar to the bow thruster debate, if the lack of a bow thruster keeps you in port on an otherwise good singlehanded sailing day, then ignore the internet experts, fit one and get out there.
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