Stellarium is good, and it's free. Just load up solar system objects under the F2 key - plugins - solar system editor - configure - solar system - import orbital elements in mpc format - select comets - select mpc's observable list of comets - get orbital elements - mark all and add to list.... and holy cow that's a long list! But you're done.
Now you only need 30 seconds to pick up a comet brighter than mag 11, at least in a big Newt. Keep taking 30 sec subs around the area until you find it.
C/2016M1 (Panstarrs) is about mag 9 at the moment.
This is one of the best comet finding pages.
http://www.aerith.net/comet/future-s.html