When traveling at high speeds you can come up on the nets quite quickly before you see them. If you’re trolling or drifting scan the lake ahead of putting your gear out. Binoculars are helpful. Most likely you will only come across 1, or 2 net sets. Once you find a net in the area you are fishing you can mark it on your electronics. They will probably not move them for a day, or two. Keep an eye out for the work boats pulling, or placing nets. Occasionally I have seen them run 2 nets end to end, so be careful with that. If you see a single, and double flag continue looking to make sure there are not 4 flags. Just stay clear a good distance. BTW they are fishing for perch. I have seen boats trolling near the nets all day thinking the commercial guys know where the fish are. There is no commercial walleye fishing allowed on the US side however the Canadians do.