I'm helping a teacher with some of her resources and am trying to find a decent world-map projection (outlines of continents) for her students to use when identifying oceans, and major longitude and latitude lines.

The one she has is OK, but the projection is not quite in proportion, so her equator and other E-W lines are not spaced correctly when the students put them on (i.e., the Northern lines not the same distance from the equator as their Southern equivalents).

What projection should I be looking for and do any of you have a high-res outline map (though preferably vector) that I could put in a PDF for her to distribute to her students (it's a distributed learning school) without enraging the copyright gods?

I'm good with links too!

Thanks,

Dave