Why PON Codes? PON Codes were designed by GPS Ireland Consultants Ltd to allow road users in Ireland get better and more efficient use of their SatNav's, particularly those in the logistics and service industries. PON codes help to resolve the ambiguity of Ireland's property addressing system which causes confusion even for the locals. What Are PON Codes? PON Codes are Position orientated Navigation Codes or PONC. A PON Code is a 7 Character Alphanumeric Code which defines geographic position to within +/- 6 meters of the equivalent Latitude & Longitude or Irish Grid coordinates for the same location. As of September 2009, PON codes are only compatible with Garmin Nuvi 7xx series, running upgraded firmware. http://www.irishpostcodes.ie