Estimating the usage to determine your subscription for your Map Provider for Dispatching can be Google, BING or ESRI if using Maximo Spatial

Dispatch tab in GA application - display for example 100 assignments 6-7 assignments for 15 labor or crews
                - for each day the user views or refreshes we will call for travel time for each labor or crew

                            - start and end location plus 7 assignments times 15 - 130 calls to the Map Provider API
                - how often do they go out and come back into dispatch view - refresh - move from day to day within dispatch view will effect your estimate

The biggest draw on the Map Provider api will be for the travel time matrix required for spatial optimization
        if there are 500 assignments with different locations in the work list we need to know the travel time for each combination
                - 500 squared is 250,000 combinations (a little more added for the start and end location of the labor or crew
                        - if they all start and end their day in the same location this is minimal just add 2 to the # of assignments)
                - when the data is supplied by your Map Provider we can only hold it for 30 days and then we must delete it
                        - if the user supplies these travel times they are never deleted and can save the api calls to Map Provider
                - you will need to determine how many work lists in a month - unique locations over the month
        - may wish to consider an option to populate the travel time from another source initially