Bit of a techie one this but I thought I'd add it in case somebody found it useful! I've been doing a bit of work with Google Maps and http://www.openstreetmap.org/ an open data source project which I have a lot of respect for. I won't go into details but I've needed to calculate distances between two points based on there coordinates and some of this has to be done on a database server...... So I've put together this very quick SQL function which returns the distance between two coordinates in God's own measurement, no not cubits, miles! set ANSI_NULLS ON set QUOTED_IDENTIFIER ON go -- ============================================= -- Author: <Christian Miles> -- ============================================= ALTER FUNCTION [dbo] . [calculateDistanceBetweenCoordinates] ( @lat1 float , @lon1 float , ...