Do you mean they can not enjoy sailling with an app on their iphone? Shame on you for even suggesting such a thing.
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Seriously, people today who do spend their time on their iphone on twitter and other such websites, are not learn the basics of body language communication. They will never experience the beautiful day when you have sufficient winds to go where you want, OR the day that half terrorizes your wife, and she threatens mutiny, while you are having the time of your life.