Of course you can fly a spinnaker without a pole or the Tacker, but bear in mind that a conventional spinnaker is designed to fly a couple of feet above the lifelines. Its foot (between the clew and the tack) should always be horizontal. Securing the spinnaker tack to the deck is not the best way to set the sail. It is too low and the spinnaker will chafe on the bow pulpit and lifelines. If you add a pennant or a downhaul, the spinnaker falls off to leeward and the pennant chafes on the pulpit and the sail looses its shape.That's when the Tacker saves the day. It holds the tack, and the luff, of the spinnaker close to the centerline of the boat and it can be adjusted up and down with the downhaul for a perfect trim.
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