διὰ νήσων τὸν πλόον ἐποιεῦντο → they kept sailing through the islands
mōbĭlĭter: adv., v. mobilis.
mōbĭlĭtĕr¹⁴ (mobilis), rapidement, vivement : Cic. Nat. 2, 24 ; Cæs. G. 3, 10, 3 || -ius Lucr. 5, 635.
