I installed this device on the aft deck and turned on the Humminbird 798 HD Si. I can only say wow. The chart is now easy to navigate and I am sure of the direction the ship is heading. They are worth owning. An external antenna is the only way out. Installation is easy. I mounted my antenna on the back deck behind my seat. Mounting is not critical as satellites can see the antenna hundreds of miles above you. It's not that they can't look over your shoulder.
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