1. This device
Open this page with a good connection on every phone before going into the field. Every line below should show a tick.
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2. Download the map
Move and zoom the map below until it shows the whole area participants may need, then choose how detailed the download should be. Everything on screen is saved at every zoom level from the widest up to the level chosen.
3. Survey answers on this device
If a phone will not get signal before it has to be reset or handed back, save a backup file and copy it to another device (or email it once you have signal). Loading that file on any phone with this survey queues the answers for upload from there. Loading a file twice is harmless.