To get a Dead Reckoning position. It would be helpful to show the inverse bearing below the bearing and distance, as you draw the first leg of a Route from a buoy, lighthouse, tower or chart object.
Then you can use multiple coastal land sightings and multiple "Route first legs" to get your position without having to calculate the inverse as you place the leg.
Since we are on the topic, another useful feature for route properties would be to allow setting the expected speed on a particular segment differently than the global expected speed.
I often do trips where part of the sailing occurs in areas where the expected speed is modified either by current or other factors (I hate to hit rocks at more then 1kt ), yet I'd like to know the trip time/ETA calculated by opencpn.