They extend too far offshore to go around them. Other than the prop cages the lobsterman have, vigilance is your best defense. Under sail is the only way to get relaxed. Definitely bring a wet suit. You may be in the water quite some time sawing away at pot warp fused around your prop shaft. Many floats also have a small toggle buoy on the same line but the connecting line is usually deep enough to go over. The trip is still worth it. Better yet, head for Nova Scotia where the season is closed for the summer.