Not really a big deal, just wondering if dark warp device is suppose to lock on to certain locations?

I had 8 DWD's and decided i would use them to move my city a bit... i used 4 of them, and after 4 DWD's i had been to one location 2 times and back to my original location 2 times. Why is it not going to other swamps, or areas? am i suppose to wait before using the DWD?