As the title says, a compass. All vector with only a little bit of reliance on various special effects like transparency, that, while Illustrator has had for quite some time but for technical reasons we’re not allowed to use at work. Lots of more technically oriented print places are generally unhappy with transparency effects. The thing to watch out for is the RIPS used to process the files just before making printing plates (or film if we’re old fashioned) generally do not like transparency effects and sometimes the workarounds can lead to unsuitable results (as in my professional work). So your mileage may vary depending on your printer. For me, it just means I’m pretty disciplined when it comes to my vector drawings and I only use the effects sparingly in my personal work.