Using navsat_transform_node to Transform Target GPS Coordinate?

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You havn't provided your setup, e.g. what nodes you are using, so I will just say what I'm using: navsat_transform_node and python.

With python I first use geodesy to convert the latitude and longitude from degrees to UTM coordinates:

point = utm.fromLatLong(lat, lon)

navsat_transform_node provides the transform world_frame->utm, so we can now just provide the goal point in UTM coordinates:

goal = MoveBaseGoal()
goal.target_pose.header.frame_id = "utm"
goal.target_pose.pose.position.x = point.easting
goal.target_pose.pose.position.y = point.northing
(...)
move_base.send_goal(goal)

The full script I'm using is here