If you want to use an Apple device in the field you have the ‘online’ option covered here, or you can create a portable network in the field.
This can be done using your phone’s hotspot option but this is not an ideal long-term solution. I would recommend purchasing a battery-powered local network router that can easily link multiple devices in the field without the need for an internet connection or power source.
I have had good success with the Hootoo HT-TM05 and RavPower RP-WD03.
Another option we found to work very well was a TP-Link TL-WR-702N Router coupled with an external USB battery.
NOTE: the TP-Link draws very little power so we found it best to use an "Always On" battery source like the Voltaic V-15 USB.
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