I'm importing an STL model of a ship. I've already scaled it down 1:5 using Meshlab, so it's ~100 feet long. When I open the file in Solidworks, I get the message "Model exceeds dimensional limits. Please select the correct units or scale value from the Options menu." But as far as I can see, I can't get to the Options menu until the import has failed! I have a part with no features, and changing the units at that point makes no change.

How do I change the units before bringing in the STL? I'm stumped.