I have a 305 Conquest and it's relative to comfort for me, If it's a Westerly over 15kts on an ebb (wind against tide)stacking I start to slow down, maybe ducking along victoria and using enterprise channel. Nothing wrong with a tailwind unless it's overwhelming and causing surfriding. See the attached appendice for frequency of fog. Typically, if it's foggy it won't be super windy but I'm not saying that can't happen so pick your vices. I'm quite comfortable navigating in fog, I use a dedicated radar screen and not overlay as the chartplotter operates on different principals and time delays. I also find it cluttered. Yes I am a career mariner as the handle suggests. Good catch by Sharphooks!