There are no stacked symbols during base play, but this is a game where you can wager a lot without dropping in balance. 5 of a kind wins are often and they have a pretty big payout so your balance will be leveled most of the time.
Like in all other video slot games the biggest payouts in the game can come during the free spins bonus. Once the bonus is triggered with Ships on reels 1, 3 and 5 you will get 10 free spins. There are no multipliers added and everything in the game functions like in base play with one little exception. The bonus symbols (Ships) also act as additional wild symbols. The free spins can be re-triggered with another set of 3 Ships on the corresponding reels and this is when the biggest wins happen. With two Wild symbols in the game you can get a lot of 5 of a kind wins during the bonus round and you can win a lot of money. This is why Nelson is one of my favorites in Amatic casinos.