I have point shapefile from a GPS device. I want to add the decimal degree location to the attribute table. I used the add x,y coordinates tool and the resulting x y and z field in the attribute table contained zeros?
what type of field was created? You did this in a table for a shapefile or a featureclass and not some other format I trust. In any event, try Add Geometry Attributes—Help | ArcGIS for Desktop
if you are having problems, it offers more options on the coordinate system and other information, although
Add XY Coordinates—Help | ArcGIS for Desktop should work fine if the the field type and data type are correct and you know the coordinate system of the input data and the data frame.
Retrieving data ...