Execution of gazebo_ros_gps file

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Hello I am new to ROS. I need gps (latitude, longitude, altitude) coordinates. I am using hector_gazebo_plugins in which I want to execute the file gazebo_ros_gps. The file gazebo_ros_gps as a published topic Fix (sensor_msgs/NavSatFix) which I need. How do I use the file gabezo_ros_gps? I am getting error,

[rosrun] Couldn't find executable named gazebo_ros_gps below /home/pallav/catkin_ws1/src/hector_gazebo_plugins

Please help!