The boat is a relatively small vessel without any visible armaments. It has an onboard kitchen which Sanji can cook in and a chimney which is also used as the ship's mast, and the appearance is based on a saucepan on top of a frying pan. Aside from that, it is merely a regular boat no different than any other.
During the events of the Baratie Arc with Don Krieg, Nami had stolen the Going Merry. In order to find out the reason why she did so, Usopp, Johnny, Yosaku, and a heavily wounded Zoro set off after her. They discovered she is heading into Arlong's territory, Nami's home island. Sensing possible danger, Yosaku went back to Baratie via panda shark to get Luffy. Upon Yosaku's arrival, Luffy decided to go to the island to aid his friends but was having problems doing so as he did not have a boat to use. That was when Sanji decided to join Luffy's crew as Luffy's cook. Sanji managed to get a boat for them to use, the boat used by the Baratie to stock on supplies.
While sailing towards their destination, Sanji prepared some food to Luffy and Yosaku dine on as the latter of the two explained the situation. The food, however, attracted the giant sea cow, Mohmoo who wanted to eat the food as well all those onboard the boat. The beast was easily defeated by Sanji for causing such a ruckus. After being subdued, Mohmoo was tied to the boat and forced to pull it the rest of the way. Due to some ridiculous steering by Luffy, Mohmoo crashed into the sea wall surrounding Nami's island and flung the little boat far into the island. The boat crashed into the forest, causing quite a mess and severely damaging it. After that, the boat has not been seen or mentioned again in the story, as Sanji evidently abandoned it after it got wrecked.