A system and method for enabling a user of a mobile communications device to select or input a second taxi-start location parameter for a substantially autonomous vehicle to navigate to within a pre-determined period of time and wherein the successful registering and processing of the second taxi-start location parameter overrides a previously user-inputted first taxi-start location parameter. The system and method includes executing a first set of programmatic instructions wherein the user can, via a coupled user-interface device, select or input a second taxi-start location parameter, and wherein the user-supplied input comprises a second taxi-start location parameter for a substantially autonomous vehicle to navigate to that is separated by a distance from a previously user-inputted first taxi-start location parameter, and wherein the distance separation is between and inclusive of 12 meters and 4502 meters. The first set of programmatic instructions is further operable to register and process the second taxi-start location parameter generated between 6 seconds and 5581.2 seconds after the generation and processing of the first taxi-start location parameter.