Snowblowers clearing a mountain road in Norway - GIF

[Frank S]

Modern GPS is accurate enough to guide a snow plow. I'm guessing that posts with flags would have been the old way. Given the depth of that snow, those posts would have to very tall.

It wasn't that many years ago that a GPS this accurate would cost $10,000. You can now get the bare receiver for $275: https://www.sparkfun.com/products/15136. This one is good to +/- 10 cm in three dimensions.

Rick

And yet many people still get lost following their GPS to the local 7-11 store.
A friend of mine recently bought a house on +/- 23 acres, The tittle deed company and his wife insisted on a survey of the property lines
Hired a surveyor to come out to locate the pins if there were any. he used GPS to locate where he thought the pins should be located.
When he finished his report it showed they only had bought 14 acres. just a slight discrepancy in land mass that's all nothing to be concerned about their $250K cash purchase was.
Another survey company scheduled for next week I think.