I have field workers that are out for weeks (or longer) at a time. They are sometimes in groups that have multiple workers deployed in a field area and they need to be able to come back at the end of the day, compile their data collection to a laptop from multiple different devices and receive new maps (with the updated data) in a fully disconnected environment.
So, in summary, the workflow is:
1) Camp is established with laptop and multiple data collection devices (such as iPads).
2) Each day, multiple groups (each with a data collection device) go out and collect data.
3) At the end of each day, data from each device needs to be uploaded to a central device (ie. a laptop) so that all the data can be viewed, and so plans can be made for the next day.
4) The following day, each group will go out and collect more data, with a new map (or with other groups' data) as required.