[sja]

As requested: answer to puzzle 4 (I think):

14.2981, 101.2189

Start from top-left, move the number of spaces given by the number of your current square:

down right left down right right up down down right down

It's a maze; worked backwards from the numbers that have commas and points next to them.

Number: 19; Title: Thailand https://photos.google.com/share/AF1QipMNGiEkdfeZKK5uus5iOmt-...

[neogodless]

Sheesh I'm dense, I think I need an animated GIF of how you're moving through the maze. I can see 1-4.-2 but then do you keep moving right a second time, two spaces, to that 9? And then you move... nine spaces to... where?

[kaoD]

I explained it here: https://news.ycombinator.com/item?id=13476158

[sja]

Nine spaces down, I believe

1-down

4-right

2-left

9-down

8-right

etc

[wes-k]

How did you work out the movement sequences?

[kaoD]

If you start at the bottom-right you can count either up or left. Going 8 places up lands on an 8 (this is the only square where delta from bottom right = number in the square) which means that square was the previous one.

Rinse and repeat.

[wes-k]

Deduction at it's finest - thanks!

[graeham]

You work from the key stops (decimal and comma), then go backwards to the only steps that can get you to these stops.

[sja]

I'll draw it out when we finish up the game :) - what the guys above me said (process of elimination)