As part of the ADS-B line in Russia, there are several points of view on which ADS-B type is better to use for drones. In addition to the 1090ES, the Swedish development of VDL-4 is offered. It is worth noting here that the 1090ES is already in use on commercial aircraft, and UAVs equipped with such transponders can be compatible. In case of ADS-B VDL-4, it is not entirely clear how exactly this type of ADS-B will make drones visible in practice, because neither Russian nor foreign aircraft are equipped with ADS-B VDL-4 equipment. In the 2000s the largest international aircraft manufacturers criticized the VDL-4 («Airbus work on VDL Mode 4
», «Boeing Position Paper on VDLM4
») and refused to equip their aircraft with this type of ADS-B. Among the main reasons were: low data transfer rate and bandwidth, the use of the VHF band and the identified interference. Obviously, in the case of VDL-4, the installation of additional equipment for universal compatibility will be required, which will steadily lead to inappropriate financial costs.