Rally Point should be position on map so that the bottom center of the icon is its location

It looks like Rally icons are placed on the map so that their top-left pixel is at their actual location. This should probably be the bottom center so that the point of the icon indicates where they are.

It's not terrible but as it is now, when the vehicle is over the rally point it appears from looking at the map as if it is actually a bit north and west of the rally point. I.e. it's as if it hasn't quite reached (or landed at) the rally point.


Start by locating the Mission Planner map-rendering entry point for Rally icons and inspect how their map position is calculated. Compare the current placement with the attached image; done means the icon's bottom center marks the Rally Point location and the vehicle no longer appears north-west of it.

Written by the indexing model from the issue text.