Lyric discussion by wheresthedamnCAPO? 

Cover art for sailing by night lyrics by Department of Eagles

I think the predominant idea explored in Sailing By Night is that of the physical presence (or its lack, rather) of a lover in proximity to the speaker: the lyrics seem to serve as a lament, indicating a longing for another who is gone. The 'picture me', 'remind the kids', and the 'my truest amor' all point to an almost elegiac tone, expressing a sorrow (nor for having 'left on a whim', but for the necessity of the separation).

And while the speaker seems entirely entrenched in a sort of despair for his faraway lover, he is also unable to describe the immensity of his happiness 'glistening overseas': thus the wordless and inarticulate 'nnn', 'nnn', 'nnn's mirroring the kazoo/synth keyboard solo (a quasi-trumpet salute).