I am on Sector 0,2 and cannot figure out how to "Switch to mech dart". Did I miss something?
You must obtain silicon to unlock the Dart Ship Recontructor. From there, power it, and once it is fully powered, walk onto it. It will change in appearance as if you had pressed it down. Once you are on it, click it, and your current mech will be reconstructed into a Dart Ship. If you would like to transform back to the regular mech, repeat the process starting from standing on it.