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Bob,
I go out of FI Inlet in an old piece of dung 17' runabout. I never go more than say 5 miles. When people fishing on the boat complain or look green, I go back to the inlet. If I hear 3-5 foot seas, I may feel it out, but I stay inside. Anything less, and I feel safe. BUT! this is just me. I feel very confortable in the water.
You really have to feel your boat out in different seas. see how it handles the water and how you handle the boat. You dont want to bury your bow. You dont want to roll too much if lying sideways. You dont want water comming over the stern. make sure your radio is working well, and your safety gear is easily accessable. The more conditions you experience, the more comfortable and safe and skilled you will be.
Also consider who is on your boat. If kids, or non-water people are onboard, tone down your spirit of adventure.
Try a day calling for 1 to 2's. Then 2 to 3's. Try different winds. Always watch the weather. If a storm kicks up, you are traveling SLOW.
Also remember, the roughest part is often the inlet itself. Stay in the channel, and keep an eye out 360 degrees. A half mile or so past the inlet, and it often calms considerably.
Give it a shot, just ease into it.
...mocean