Understanding Coordinate Systems in Surfer - Golden Software Blog
Distance calculation
Deciding how many decimal places to include when reporting latitude and longitude – Behind the Map
Calculating your own GPS accuracy – Oplopanax Horridus
My GPS Coordinates and Location:Amazon.com:Appstore for Android
How Big is a Degree? – State Cartographer's Office – UW–Madison
Converting and Displaying Coordinates in ArcGIS 10
A Quick Guide to Using UTM Coordinates
convert - Conversion between lat/lon and local coordinate system - Geographic Information Systems Stack Exchange
Mapping x,y sampling data to real-world GPS coordinates
How much is the error in physical longitude and lagitude (e.g. meters) corresponding to a +-0.0001 error in GPS coordinates? - Geographic Information Systems Stack Exchange
arcgis desktop - Decimal Degrees to Meters - Geographic Information Systems Stack Exchange