GPS Land Stations are installed at the coastline of the Indonesian mainland and at the islands off Sumatra. Their main task is the detection of horizontal and vertical deformations of the earth's surface due to a strong earthquake. This can be done in a very short time and with an accuracy of few centimeters.

Both the buoys and the tide gauges are equipped with GPS instruments, too, which monitor their particular location and shifting regarding the horizontal position and the altitude.

Furthermore, new technologies like GPS reflectometry are studied and evaluated regarding tsunami early warning issues.