Average GPS coordinates for Semaphore Postcode location: -34.833, 138.483. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Semaphore on map:

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Listing cities & postcodes (1):
>> South Australia, 5019 Semaphore, SA CITY SUBS, GPS coordinates: -34.8333,138.4833