The tsunami disaster is a potential disaster in the territory of Indonesia. Indonesia is an archipelago country and
close to the ocean deep. The tsunami occurred in Aceh province in 2004. Early prevention efforts have been carried out.
One of them is making "tsunami buoy" which has been developed by BPPT. The tool puts sensors on the ocean floor near
the coast to detect earthquakes on the ocean floor. Detection results are transmitted via satellite by a transmitter placed
floating on the sea surface. The tool will cost billions of dollars for each system. Another constraint was the transmitter
theft "tsunami buoy" in the absence of guard. In this study of the system has a transmission system using radio frequency
and focused on coastal areas where costs are cheaper, so that it can be applied at many beaches in Indonesia are
potentially affected by the tsunami. The monitoring system sends the detection results to the warning system using a radio
frequency with a capability within 3 Km. Test results on the sub module sensor monitoring system generates an error of
0.63% was taken 10% showed a good quality sensing. The test results of data transmission from the transceiver of
monitoring system to the receiver of warning system produces 100% successful delivery and reception of data. The test
results on the whole system to function 100% properly