In complex geological formations, optimizing wellbore placement presents a difficult challenge. The Baker Hughes VisiTrak geospatial navigation and analysis service increases well-construction efficiency by reducing seismic uncertainty and avoiding costly pilot holes and unplanned geological sidetracks (Fig. 5). The advanced logging-while-drilling service makes it possible to define reservoir architecture by mapping multiple bed boundaries in real time, without the need for pilot holes that are typically drilled to evaluate the formation before drilling the horizontal portion of a well. The service combines extradeep azimuthal readings with full interpretation of complex geological scenarios, to give operators a better understanding of the reservoir architecture. The service, which is built on more than a decade of reservoir-navigation experience using both omnidirectional and azimuthal technologies, consists of four key components: a set of sophisticated downhole sensors, reservoir-navigation-service experts, multicomponent real-time inversion-modeling software, and advanced 3D visualization software. The VisiTrak bottomhole assemble uses short transmitter/receiver spacing to position the modules closer to the bit, which enables earlier detection of remote reservoir boundaries. The modules operate at two frequencies—20 and 50 kHz. For each frequency, the VisiTrak service provides long space measurements of phase difference and attenuation resistivities, along with directional signal-strength measurements that provide a 360° view of the borehole.