Most nodes can’t distinguish between different inputs, so your switch nodes aren’t going to magically join the input from your GPS/temp to the switch. So what you need to do is use the JOIN node to join the different bits together
There is a very similar flow being discussed in another thread DS18B20 Temperature Driving Wemo Switch
That covers 3 sensors, but effectively you have 4 Latitude,Longitude,Temp and Switch
So the JOIN node will only pass a message on when it gets all 4, take a look at this flow and see if it helps.
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This sounds far more interesting that my summer project in my geology degree which I spent watching mud dry!
