Two answers to your two questions
gwood,
GFBL is for Go Fast, Be Loud. It is the big HP multi-engine boats that in some cases go 70++ miles per hour. They often have through the hull exhaust that brings with it a sweet tone to some, and a lot of noise to others.
I use boat lengths to judge the 150' and I try to error on the longer side of the rule. My boat is about 24' so I use seven boat lengths as my guide. It is harder to measure in some dim light conditions and at times you are making judgements on several or more moving boats and fixed land points at one time, so it gets to be a bit of a test, especially on the weekends. The mid-weeks are not usually an issue. The area around the Weirs is great if you like a challenge.
Enjoy the vacation and please let us know your thoughts when you get back home.
R2B
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