The document summarizes two pre-studies conducted to help plan a field operational test comparing navigation systems. Study 1 was a questionnaire of 147 drivers that found owners of navigation systems drove more and were more likely to take unfamiliar routes. Study 2 tested data collection and analysis algorithms by having 10 drivers complete routes with and without navigation, finding the algorithms could detect differences but needed improvement to reduce errors. The pre-studies aimed to inform sample selection and analysis methods for the larger field operational test.