The present invention refers to a power supply sub-main (30) power is cut off when replacement use as a power supply of uninterruptible power part (40) and a, door (3) to open and close the a fixing structure used for identifying components (2) with cabinet (1) various navigation related information is contained within the sensor section (10) through a communication network and a boat navigation recording unit (20) comprises voyage recording security device in, a power supply sub-main said (30) low when a power supply device from directly uninterruptible power part (40) of toner having warning signal by supplying the power (60) to inform power-off sensing unit (51) and a, said microcomputer (60) signal and the reset of the peripheral under control of the frequency situation of (70) and a, said camera (70) the photograph a memory storing information (80) are made out of a material which includes on configuration the techniques base features in that. Therefore, vapor receiver (11), GPS receiver (12), radar (19), sound detector (13), speed reader (14), gyro compass (15), voting [...] (16) a sensor section (10) is installed in the inside of the various navigation-related data and accurately maintaining than real estate can be conserved as the push artifacts an outer clad pipe plate useful to the body..