There is some inconsistency with the drawing of the track lines with the positioning of 180 deg Lon in the display window.
If 180 is just to the right of center screen (displayed as 180 E) then track lines stop at 180 and only points appear farther East.
Conversely if 180 is just to the left of center screen (displayed as 180 W) only the track lines east of 180 are shown.
It's not really a big deal unless you are following boats on both sides of 180.
Anyway, just thought I'd give you a "heads-up" in case you weren't aware of it.