Precise X, Y, and Z coordinates directly from the nodes themselves. Each NuSeis nodal recorder logs GNSS satellite phase and range data to allow differential processing (DGPS) yielding sub meter accuracy X, Y, and Z coordinates directly from each deployed node. Don’t buy nodes that can’t tell you exactly where they were in X, Y, Z space, or nodes that require an external survey to log the deployed location. Those systems are prone to error and add unnecessary work and cost. Look forward to no more survey, and no more geometry errors.