Humminbird 6.180 is a feature release. One feature enhancement is to the Main Navigation Tab item Chart Orientation where your options are north-up, head-up or course-up.
North-up displays your map with a north direction orientation.
Course-up displays your map with a course direction orientation.
Head-up displays your map with a heading direction orientation.
If you have a waypoint, set a heading to it, then Head-Up will orient map so the waypoint heading is to top.
Very similar to course-up, but a little different.