Jody is planning a presentation on the historical advancements in ocean navigation and sea-floor mapping. What will she MOST likely say about radar?

Radar has been replaced with the Global Positioning System (GPS).
Radar calculates an object’s distance away from the receiver.
Radar is now part of GIS (geographic information system).
Radar helped early ocean navigators find their longitude.

Radar helped early ocean navigators find their longitude.