While InRoads does not have this functionality, you might want to look into the MicroStation GPS capabilities. Take a look at this video:
www.bentley.com/.../Comprehensive+Breadth+and+Depth.htm
If you scroll to the bottom of this page, there is a video called “Using GPS data in MicroStation” that relates to this tracking issues.
It may be possible to use this functionality as the first step to track your locations. You could then use InRoads commands to annotate the locations based on alignment stations and offsets.