Focus current craft on orbit map

As of May the 4th (the time of my checking and verifying), the key used to focus the active vessel is the back quote: ` .

(That is the key next to the 1 on the US keyboard layout)

Source: https://www.reddit.com/r/KerbalAcademy/comments/5k5ne5/how_to_focus_the_map_on_the_active_vessel_in_121/

You can use the backspace key to focus on your current ship. This should reset the zoom level as well as the position.

They changed it to ` (also the ~ key). It's the button to the left one the 1 key on the number line.