And landmarks and with the stars, they are guided.
Hill and mountains are cast on earth as nails for keeping the earth in its equilibrium. Landmarks are different from region to region. So, the man can distinguish the places easily. In desert and sea as there are no landmarks, stars are observed for getting the direction as explained in 6: 97.
Mischief is appeared on the land and in the sea because of what men’s hands have earned as explained in verse 16: 6. Today among the mankind, Arabic Quran reading Fujjar are reading these verses. But by hiding and rejecting Adhikr and Its 40 names they are following 29 pseudo-prophets and are hurrying for the Antichrist and Doomsday. As there is no group of believers anywhere in the world, the odd believer conveys Adhikr to entire mankind irrespective of nation and religion for keeping the universe in its equilibrium as explained in verse 2: 62. See explanation 8: 22; 10: 60-61 and 15: 16-20.