Distance of user from home

[672southmain]

This post from last August for another user may be useful:

Convert Latitude/Longitude to Geofence for Presence

For reasonable distances (within a city/town/state), the Haversine Formula is pretty accurate, certainly good enough for presence: distance(lat1, lon1, lat2, lon2): p = pi/180 a = 0.5 - cos((lat2-lat1)*p)/2 + cos(lat1*p) * cos(lat2*p) * (1-cos((lon2-lon1)*p))/2 return 12742 * asin(sqrt(a)) edit: source: https://stackoverflow.com/questions/27928/calculate-distance-between-two-latitude-longitude-points-haversine-formula