Why satellites do not make shipboard radar obsolete

Do orbital surveillance satellites make surface-search radars aboard ships obsolete?

No; coverage, data access, allied dependence, communications, and the possibility of satellites being disabled all make organic sensors necessary.

A satellite must be over the right place, remain functional, and deliver usable data to the ship in time. Reliance on an ally's constellation introduces another dependency, while wartime attacks may remove the service entirely. Resilient naval surveillance therefore combines remote networks with organic radar instead of choosing one source.