Abstract: The invention relates to a method of providing information to a surgeon about a location of a contact of a lead in a brain of a patient, comprising: receiving a first reading using a microelectrode at a first location; receiving a chosen target location for a lead comprising a contact according to the first reading; receiving at least one second reading at a second location at or near to the received chosen target location using the contact of the lead; performing a correlation between the first reading and the second reading; estimating a distance between the first location and the second location using a result of the correlation; providing information to the surgeon regarding one or both of a distance and a direction between a location of the contact of the lead to the chosen target location.