It would, however, seem like a straight line to whoever was on the boat, because they'd be traveling due west the whole time, and the course corrections they'd have to make to keep going west would look the same as course corrections needed to account for wind, ocean currents, etc.

[–] ChaoticNeutralCzech 1 points 3 weeks ago

I know but you need to be the right amount of pedantic. Too little and any sufficiently large curve seems straight, too much and you point out that there is no straight line on the surface of a sphere.