cmake nav_msgs examples

jkk-research/pointcloud_to_grid CMakeLists.txt :17 

find_package(nav_msgs REQUIRED)

MRPT/mvsim CMakeLists.txt :159 

find_package(nav_msgs REQUIRED)

SICKAG/sick_scan_xd CMakeLists.txt :331 

find_package(nav_msgs REQUIRED)

MRPT/mrpt cmakemodules/script_ros.cmake :94 

find_package(nav_msgs QUIET)

septentrio-gnss/septentrio_gnss_driver CMakeLists.txt :159 

find_package(nav_msgs REQUIRED)