Whilst in Maryland we attached (using the most advanced scientific methods) a 5TE sensor to the boats. This sensor was able to collect data on electrical conductivity & temperature.
Back in the lab this data was feed into the computer which then spewed out some fantastic results.
The video below shows spacial graphs of electrical conductivity and temperature. As you can see, these readings varied quite significantly across the lake.
Some other views of the pond
View 2: Arial view