Mounting Plate to your boat deck and use the 4 flange bolts to bolt your mount to the deck of the boat. This setup is great for those who like to travel or like to store your electronics inside. Compatable with all mounts.
Comes with the 4 Serrated Hex Bolts
The square mounting plate is typically used on aluminum boats
The round mounting plate is typically used on fiberglass boats
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Purchased the square plate for my aluminum boat. The plate is permanently mounted to the deck and the Ultimate mount is then mounted to this plate making any future remove of the mount much less complicated. This plate is not mandatory but is well worth the cost in future headaches saved. The piece itself is very robust and well made.
If you are going to buy a mount, this is a must. If you ever want to remove from deck, no way you want to get underneath again. Also makes the initial mount easier