Hey Rostyslav. This exact topic came up during beta. Ryan ad asked me about the marker beacons. And my honest answer was You know, I dont recall ever hearing the marker beacons going off in our plane. Up here in Canada we gt rid f marker beacons in the 90s but we do fly down in the states a lot. I am not sure if the marker beacon is an option (it must be) for the NG. So to tell you the truth I wouldn't know how to turn them off on the NG. I would assume (and a big assumption) would be they might work in conjunction with the ILS freq. so by turning the freq to 108.00 would ALMOST guarantee the dsabling of the beacons. I havent come across any ILS freqs that are 108.00. In fact the only 108.00 freq I know of is around LAS. I dont think its an ILS freq though. I only know it exists because unless we are using the NAV radios, they are always on 108.00. So we we are near LAS the green dashed line always appears on our ND.