领航 is a verb-object compound (离合词) meaning to pilot or navigate. As a verb-object, it can split: you can insert aspect markers like 过 or 了 between 领 and 航 (e.g., 领过航 'has piloted'), or a measure word (领了一次航). It also functions as a noun meaning 'pilot' or 'navigator', used as a single unit (e.g., 一名领航 'a pilot').