I too am really enjoying watching your blog unfold Charlie.
forrrge is right, a test of some more serious (and useful / intreresting?) apps might be worth trying.
Google Sky Map:
https://market.android.com/details?id=com.google.android.stardroid&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5nb29nbGUuYW5kcm9pZC5zdGFyZHJvaWQiXQ.. This is a great app, but I'm still seeing things differently on the Excel as opposed to my GPS equipped phone... I now see the same area of sky, but the orientation is 90 degrees different. Have you got an Android phone? Do you see any differences between the two?
GPS Essentials
https://market.android.com/details?id=com.mictale.gpsessentials&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5taWN0YWxlLmdwc2Vzc2VudGlhbHMiXQ.. I haven't exhausted all the set up options, but this one works great on the phone, but doesn't seem to do anything on the Excel.
Excel