Jakarta
The Museum Satria Mandala, the main Indonesian Armed Forces Museum in Jakarta. Opened on 5 October 1972, it is located on 5.6 hectares (14 acres) of land in South Jakarta and holds numerous artefacts, weapons, and vehicles. There are various exhibition halls and several war machines, mostly on the museum grounds. This includes the ship KRI Pattimura, which saw action in Papua; many aircrafts and land machines such as tanks, ambulances, and a Willys MB belonging to General Sudirman. Sudirman (24 January 1916– 29 January 1950) was a high-ranking Indonesian military officer during the Indonesian National Revolution. The became first commander-in-chief of the Indonesian Armed Forces and he continues to be widely respected in the country - Wikipedia.
This cache can only be obtained during the opening times of the museum, which is 9am to 2.30pm each day except for Monday when it is closed.
The coordinates will lead you to the musuem grounds near where a number of aircraft are displayed. To get the final coordinates, answer the following questions about the planes on display:
A = Presidental plane RI-00?
B = Fairey Garnet MK?
C = North American B2? Mitchell
S 06.13.89A, E 106.B9.09C
You do not need to enter the main museum, but if you would like to view the exhibits inside, entrance tickets can be purchased for IDR 4,000 (which is about 30 cents USD) at the front of the main building.