system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: With sonar, radar technologies so advanced, why is it that we cannot simply scan bodies of water to get a very clear picture of the size/amount/even type of creatures lurking below?
gpt
sonar is very inaccurate at small detail because it depends on the water being a consistent medium that sound consistently echos the same way.   problem is....water isn't consistent.  salinity, temperature, current all distort how quickly sound travels thru.

radar has no application since radio waves don't penetrate water that well.