What excel file? Are you talking about the track file produced by BD Mobile? Are you talking about the lat/lng coordinates imported into BD Desktop from your BD Mobile outing?
The answer depends on the source of the data and the type of data.
Google Earth does a great job showing you routes with lat/lng coordinates as long as you build a properly formatted KML file. Just double-clicking the KML file will launch Google Earth, if installed on your computer, and zoom right to the coordinates.
Surprise: Birder's Diary Desktop v5.2 (coming soon) will build these KML files and launch Google Earth for you and display your sightings from the View/Edit Sightings window!!! It is very cool. For example, below is a look at one of my recent outings here where I live. All done automatically from BD v5.2 using the lat/lng captured from an outing with BD Mobile.
Of course, if you have used Google Earth, you know that you can now Zoom in, pan, rotate, tilt and so much more. Super great tool.
If you click on any sighting, you get the count, sciName, comments, date and time of the sighting.