Show move range in turn based game?

Basically I want to show the area where current character can move to.
Examples will be Fire emblem and X-com series, but without grid or tile based movement.
I know this must work with navigation but haven’t got anything useful yet.
I will really appreciate any help!
Thanks in advance!

Could you clarify a bit? Do you want to show the navigable area or just draw circle for the movement radius?

the navigable area. So the area shown will change where movement cost is higher for example entering bushes, and will not show areas behind a wall instead of a single circle.