How to calculate GPS XY offsets

Hi,
I need some help with post processing lat long GPS data to more accurately plot where sensor readings were taken. I have a CSV with columns: Lat, Long, Sensor 1 reading, sensor 2 reading.
The problem is that only one lat long is taken every second, but 2 readings from 2 different sensors are taken. The sensors are offset in permanent positions.
I need help with a method where I can input the offsets for each sensor (the sensors are behind and to the left of the GPS (I don't know the exact distance in centimeters yet), as the machine moves forwards) and then run the macro /function on the data to create a new lat long for the reading from the 1st sensor and for the 2nd sensor, and assign the sensor reading accordingly!
Hopefully this all makes sense?
Any advice would be greatly appreciated!
Many thanks,
Alex

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