Average GPS coordinates for Chatham Postcode location: -31.9, 152.483. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Chatham on map:

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Listing cities & postcodes (1):
>> New South Wales, 2430 Chatham, HUNTER, GPS coordinates: -31.9,152.4833