1. A method of operation of a navigation system comprising: accessing points of interest; identifying a target of interest including a field selection based on accessing the points of interest; generating a categorical set and a further set from the points of interest based on the field selection of the target of interest; calculating an error-related probability based on the categorical set and the further set; and determining an erroneous entry associated with the target of interest based on the error-related probability for displaying on a device.