EDIT
I quoted the wrong message, Neil said earlier
just a thought, one type of deliberate mistake is used to catch out map-copyright snatchers called 'trap streets' they are fake features that help prove copying has taken place.
Oh Neil, you've just ruined my day!
I used to trust maps but now it seems like everything in this life they have to be taken with pinch of salt, I wonder what can we trust?
Recently I was discussing the instruments on my car dashboard with a very senior engineer that worked for the manufacturer and he explained why his car company were able to control the engine coolant temperature with a very high degree of stability.
The water temperature gauge indicates that after starting from cold the engine quite quickly reaches 90 degrees and than stays there! In hot and cold weather, up hill and down dale, it sits at 90 degrees. Since I knew it has a mechanical thermostat I was quite impressed with the overall performance of what is quite a simple servo system.
He explained that the manufacturer regards the temperature gauge purely as a warning light, as soon as the coolant is (say 70 degrees) the software driving the meter needle puts it a 90. Thereafter it stays at 90 and only increases if the temperature is above (say 110 degrees).
As long as the needle is in the middle of the scale the car driver does not have to worry and 'eventually' I had to agree that the system works. Do we really need to know if the water is at 81 or 82 degrees, as long as it within a certain window everyone's happy.
Ian P
PS I hope any apostrophe characters I used are within editorial limits!
Edited By Ian Phillips on 16/05/2016 17:39:36