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I circulated the information about using an iPhone as a basic survey station to the staff here at the School of Earth and Enviromental Sciences and found out that it has already been done. We run a subject with a week long geological mapping field trip. One of the students' tasks is to measure strike and dip of rock strata, normally using a Brunton compass ($300+ each). Last year some students used an iPhone and their data was as good as that obtained with the Bruntons. Of course there is always user error in student data and the undulations on the surface of any outcrop mean that even experienced users will get slightly different results. So while I wouldn't use an iPhone to build roads, fly aircraft or scuba dive it seems that for some application they may be perfectly acceptable.
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