The exceptions mistakes method of posit ion determination when navigation systems at the same time are used

The mistakes of determination of position of such navigation systems like GPS-NAVSTAR (USA), GLONASS (Russia), GALILEO (European Union), IRNSS (India), QZSS (Japan) and the method of determination of position of the object with the most accuracy are considered. And also the method of determination in which of navigation systems the measuring mistake of determination of position was included specially.