Defense missions invading planet marker

There should be a marker or indicator on the global map or planet tab that identifies the origin of invading forces in defense missions. This would better inform people of strategic opportunities to defend multiple planets by liberating the origin planet. Also, it would allow the opportunity for using the DSS or orbital blockade properly. Not enough people are aware that it would prevent defense campaigns from originating from where the blockade is activated.

Overall this information would better allow votes towards more strategic placement of the DSS.