For years we did surveys with a customized solution with a Starfire GPS ( https://en.m.wikipedia.org/wiki/StarFire_(navigation_system)). It needs a subscription for best accuracy (see https://www.navcomtech.com/en/product/globalcorrectionservice/). It was linked to a trimble handheld data collector like this https://geospatial.trimble.com/products-and-solutions/geo-7x that have another integrated GPS. Pathfinder office is a great piece of software. I have to say that it was a bit difficult to handle all of this and needs a lot of checking and correction to have something reliable.
I think it should be possible to use a smartphone. I did some tests with Mobile topographer which is pretty good and can be connected to an external gps using Bluetooth/serial/usb converters and some Android dedicated apps (like Bluetooth gps provider). But results needs to be checked, and it takes time. The accuracy is not all. A GPS has to be fast ! Professional GPS really are faster. I have to say that if I had to make large surveys again, I'd prefer to rent a professional solution. Maybe it's not cheaper but quality and saved time is worth the price. Jésahel
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