1. A method of calculating weighted deployment rules in an emergency-vehicle-units deployment system for a geographical area, the method comprising: receiving, from at least one external resource, location data and status information for each of a plurality of emergency vehicle units; storing the location data and status information for each of the plurality of emergency vehicle units in a memory buffer; storing a list of priority indicators associated to each of a plurality of posts in the memory buffer; storing in the memory buffer a list of weighted deployment rules for deploying the plurality of emergency vehicle units to the plurality of posts; applying a deployment calculation formula for calculating a deployment recommendation considering the list of weighted deployment rules, the location data, the status information and the list of priority indicators from the memory buffer, the deployment recommendation comprising one or more suggested deployments, each suggested deployment providing a suggested target post from the plurality of posts for one of the plurality of emergency vehicle units; at the computer, sending the deployment recommendation to the user interface module for display; at the computer, receiving an updated deployment recommendation from the user interface module; at the computer, sending the updated deployment recommendation to the user interface module for display; calculating an updated list of weighted deployment rules in order for the deployment calculation formula to provide a new deployment recommendation considering the updated list of weighted deployment rules, new location data, new status information and a new list of priority indicators; and at the computer, sending the new deployment recommendation to the user interface module for display.