Correct. We have mapped earth's moon better than the ocean floor so I can understand we only see those tracks of lines in "Google's Ocean". Using sonar to find you way through someplace is not the same as doing good data recording and mapping if the ocean floor.
A good example "ship track line" are terrain maps of planet Venus and Saturn's moon Titan in which the space probe can only map the track area where space probe has been and anywhere between is the "blur of unknown". You cannot clearly see through the atmosphere of these two space object and you need radar to "see" through the atmosphere to map the surface properly.
What you are seeing are the lines if know ship tracks where they have mapped the ocean floor and the areas between are the "blur of unknown". Maybe Google should change the pattern of the "blur of unknown" to an red and white checker pattern for areas of unmapped or unknown areas to clearly show that they don't have the data in that area. I know that they did that do that on old GPS maps a long time before the Space Shuttle did an radsr map of the earth awhile back to get accurate map of earth's terrain.
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