It is what you said. Now you claim it takes 'lots of thermometers'. You are claiming an average. What is the margin of error? An average without a margin of error value is useless.
Ocean water isn't all the same temperature.
Math errors: Failure to declare and justify variance. Failure to calculate and publish margin of error value. Failure to use raw unbiased data. Failure to declare boundary.
Argument from randU fallacy.
There are none (except to measure the temperature of the satellite itself). No satellite can measure the temperature of the Earth. The emissivity of Earth is unknown and cannot be measured.
A buoy is not a thermometer, though thermometers may be mounted on one. You are still ignoring statistical mathematics.
Buzzword fallacy.
Buzzword fallacy. The use of telemetry makes no difference.
It is not possible to measure the temperature of the ocean.
Nah. It is YOU that is discarding statistical math, just like NOAA does.