Mark 1:19 New English Translation

¹⁹Going on a little farther, he saw James, the son of Zebedee, and John his brother in their^[a] boat^[b] mending nets.

Mark 1:19 tn Or “a boat.” The phrase ἐν τῷ πλοίῳ (en tō ploiō) can either refer to a generic boat, some boat (as it seems to do in Matt 4:21); or it can refer to “their” boat, implying possession. Mark assumes a certain preunderstanding on the part of his readers about the first four disciples and hence the translation “their boat” is justified (cf. also v. 20 in which the “hired men” indicates that Zebedee’s family owned the boats).
Mark 1:19 sn In 1986 following a period of drought and low lake levels, a fishing boat from the first century was discovered on the western shore of the Sea of Galilee. It was excavated and preserved and can now be seen in the Yigal Allon Museum in Kibbutz Ginosar north of Tiberias. The remains of the boat are 27 ft (8.27 m) long and 7.5 ft (2.3 m) wide; it could be rowed by four rowers and had a mast for a sail. The boat is now known as the “Jesus boat” or the “Sea of Galilee boat” although there is no known historical connection of any kind with Jesus or his disciples. However, the boat is typical for the period and has provided archaeologists with much information about design and construction of boats on the Sea of Galilee in the first century.

New English Translation (NET)