Kautilya's Arthashastra 2.16.24

2.16.24

vāripathe vā yānabhāgakapathyadanapaṇyapratipaṇyārghapramāṇa.yātrākālabhayapratīkārapaṇyapattanacāritrāṇy upalabheta //

Or he may take his merchandise to other countries through rivers (nadípatha).

He shall also gather information as to conveyance-charges (yánabhágaka), subsistence on the way (pathyadana), value of foreign merchandise that can be obtained in barter for local merchandise, occasions of pilgrimages (yátrakála), means that can be employed to ward off dangers (of the journey), and the history of commercial towns (panyapattanacháritra).