An example of how a pin drop could be used for Fencing check:

You could predetermine the following information on the device (each button has a different colour representation on the map).

button 1 = Fence ok

button 2 = Fence requires maintenance

button 3 = Fence broken

While the fence check is being performed the operator could carry a device (it wouldn't need to be fitted to a spray unit) and at each check point they would press and hold the device button briefly that represents their findings, the report would then show you each location on the map where each button has been pressed and what the status is. You could easily identify the areas requiring maintenance as they would be a specific colour.