1. Bathymetry is the measure of the depth of water in oceans, rivers, or lakes. Bathymetric maps and topographic maps are similar, however topographic map lines connect points of equal elevation. Bathymetric maps show the shape and elevation of land features.
2. Oceanographers mapped the ocean in the past by throwing a heavy rope over the side of a ship and recoding the length of rope it took to reach the seafloor, unfortunately the results were inaccurate and incomplete.
3. They now measure the ocean floor with sonar, which leaves less room for inaccuracy.
4. Multibeam echo sounders are effective because they're correct for the movements of the boat at sea which increases the measurement accuracy.
5. The thousands of seamounts were discovered in the central Pacific Ocean.
6. Their measurements support safe navigation and protect marine environments around the globe
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