1. A mobile electronic device, comprising: a non-transitory computer-readable medium having computer-readable instructions stored thereon; and a processor coupled to the non-transitory computer-readable medium, wherein the processor executes the instructions to: calculate a distance between a reference location and a current location of the mobile electronic device; calculate a travel time for the distance based on a speed; determine a nature event time; and cause a return alert indication to be signaled based on a comparison of the calculated travel time and the nature event time, wherein the processor executes the instructions to calculate the distance between the reference location and the current location as a return distance between the current location and a starting location of a route traveled from the starting location to the current location, wherein the speed is an average speed en route from the starting location to the current location adjusted for changes in terrain for a return route relative to an outbound route.