Corona SDK - update GPS

local currentLatitude = 0
local currentLongitude = 0
local updateGps = 5000 -- update Gps every X seconds

local locationHandler = function( event ) 
  -- On update, stop listening to GPS signal to avoid battery draining
  Runtime:removeEventListener( "location", locationHandler ) 

  -- Check for error (user may have turned off Location Services)
  if event.errorCode then
    print( "Location error: " .. tostring( event.errorMessage ) )
  else
    currentLatitude = string.format( '%.4f', event.latitude )
    currentLongitude = string.format( '%.4f', event.longitude )
      
    print('current latitude: ' .. currentLatitude)
    print('current longitude: ' .. currentLongitude)        
  end
end

local function updateGPSTimer()
  -- Reload GPS location
  Runtime:addEventListener( "location", locationHandler )    
  
  -- Update again
  timer.performWithDelay( 5000, updateGPSTimer )
end
-- Start GPS timer
updateGPSTimer()