I purchased a compass and a thermometer in Bangkok, Thailand, I hooked it on my camera bag.
I was on a rented motorcycle; I was not able to find a map. I kept asking for Garung Merapi and finally had people point. At one juncture, though I decided I needed to look at the Compass.
The Danger of going to see Mount Merapi Volcano was not the Volcano; it was the motorcycle ride to the volcano. There are no rules, everyone runs stoplights, passes on the left, passes on the right, stops, turns, and nothing is predictable except chaos. Travel Compass