IMHO, Now that you have a "Heading Line" lose the "Show View" cone. The "Show View" cone implies a "field of view', which is not accurate.
The Heading Line will become more useful as gyros now are starting to be incorporated into phones and tablets.
The hardware compass on my HTC EVO 4G is nutslos. With a lot of figure 8s, i'm lucky if it reads within 15deg of correct heading, and it does not stay in calibration for long. In fact, when I first downloaded Locus, I was concerned that the locus compass did not have an Index, or "Lubber" line. Once I saw how innaccurate the hardware compass is, I realized it doesn't matter. So i'm glad the Heading Line is an option in settings.
The arrowheads on the Heading Line and Course Bearing Line appear to be at a random interval. Could instead there be tic marks at certain intervals? That would turn the lines into measuring sticks.
BTW, what you are calling the "Course Bearing Line", in airline nav displays is more accurately called "Projected Track".
BTW,this app is asymptotically approaching perfection.