Electromagnetic (EM) Surveys – Data Contour Maps or Not?

Traditionally, results of electromagnetic surveys utilizing EM instruments such as Geonics EM31 or EM61 are usually presented in contour maps. A picture is worth a thousand words -- these data contour maps, especially when drawn in colors, can be very powerful presentation materials showing details of investigation results. However, when the budget of a project is limited, it’s possible to lower the survey cost, but still achieve the same investigation goal without contour maps as the final output. This can be done with the reconnaissance survey mode without setting up GPS or a manual grid. By doing so, both field time and office time are saved, hence the cost is lower. So, should you set up

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