I have the same experience with you. The GPS direct us to the middle of the road in which there is no houses around. Luckily the sky is not dark yet at that time. I even could not see the 大地圖 mentioned by you. I was arounnd the junction for 3 times until I saw someone on the road and ask about the direction. Next morning we found that it's because I went from the opposite way, otherwise I shall be able to see the signage of the pension.