I'm doing an offshore trip within the next few weeks . 350 miles. I've made this trip every year for 18 years and the one thing I have learned is you cannot lock in a particular date. You need to find a window when the wind, sea and weather cooperate.the sea doesn't care when you have days off or when you booked a hotel. I've been in situations that started out looking reasonable and quickly deteriorated into life threatening. And that's not on a 9 foot Spark , it's on a 53 foot sloop. The guy who posted his ride to Bimini and back was very experienced at this. He picked his weather and came back the same day. He had Epirb,sat phone , chart plotter and anything else needed.from what I can see after 40 hours on salt water with the Spark, anything more than a couple of foot sea would be unbearable and dangerous for an extended trip on the Spark. That means quite calm conditions. There are those days but they are elusive.there are also days offshore that start that way and turn into 15 foot seas and I have to tell you that marine forecasts are notoriously wrong.if you do this trip and you don't have perfect conditions both ways you are risking your life. I've lost 2 friends in the past few years who made bad ocean decisions.the ocean has to be treated with great respect. I don't mean to rain on your parade but unless your very experienced you need to hear this.