USSR also similarly maintained very detailed ocean/sea maps, and the stream of corrections and new information was coming non-stop (i had a relative working in

USSR also similarly maintained very detailed ocean/sea maps, and the stream of corrections and new information was coming non-stop (i had a relative working in the hydrography department at the Navy base). People in marine navigation may know the company Transas - a USSR/Russian company, a digital marine navigation systems pioneer back in 199x and one of the leaders in the industry and which supply digital navigation systems for example even to Sweden and Germany Navies - the company was founded in 1990 by some very entrepreneurial and technical people who kind of "privatized/commercialized" ocean/sea mapping and navigational info collected in USSR.