With the tantalizing possibility of a manned mission to Mars in the offing, NASA’s most recent call for astronaut hopefuls resulted in a record 18,300 applications. But if you missed the deadline (or have an aversion to spending seven to nine months in a cramped spacecraft with three other people), there’s another way to get involved: Make a map for astronauts to use on Mars.

Sure, NASA has plenty of scientists hard at work mapping the geology of potential Martian landing sites. But designing maps to help humans navigate, study, and survive in an alien landscape will require an entirely different set of skills—the kinds of skills that cartographers, graphic artists, and people who love maps might have.

So, the International Cartographic Association