Mariner used in a sentence

Mariner in a sentence as a noun

He was a mariner, was around 20 when he died.

Which may be ok -- you're not aiming your product at professional mariners.

That's not "modern" or "done right" and it's not something a professional mariner would be caught dead using.

If you want actual mariners to buy your app over others, it wouldn't hurt to make it a bit more expert-friendly and show what makes it special.

Interestingly, the fun fact is something any mariner could have told a missile designer.