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In order to facilitate a single operator controlling multiple unmanned vehicles, numerous autonomous support tools are being considered. One such candidate tool monitors the situation and alerts the operator when a deviation from the vehicle’s plan has occurred. The goal of this research was to develop an effective visualization method for conveying plan deviations. Two interface formats were developed based on a review of the literature: a pie chart and a bar chart. Each format allows an operator to compare values for parameters that have different units, value ranges, and relative priority. Twelve participants were tested using a 2 (chart format) X 3 (number of parameters) X 4 (question type) repeated measures within-participants design. Both objective and subjective data were collected. Participants both preferred and were faster at retrieving parameter state and priority information from the bar chart versus the pie chart.