JUNCTION VIEW--- Apparently Garmin users are very familiar with this graphic. (Remember Garmin?). If you have the Junction View box checked, every time you get to a fork in the road, or a lane-split on the highway, your SatNav map on the screen will briefly be replaced with this second picture.
In a Jaguar, this image matches the time of day when you’re driving, shows which lane you want to get in, and which lanes you need to avoid. You get this screen automatically when you get within about ½ a mile before an important junction. This is familiar to Garmin users, and works for me when I’m on the expressway. But you have to decide for yourself if it’s useful.
TMC Route Mode--To me this setting has the most powerful control over SatNav.
Let’s say 20 minutes after you’ve started driving on a course that the Nav has created for you, the SatNav “sees” a new traffic accident that just happened somewhere ahead on guided route. You haven’t reached the area yet, but eventually the traffic is going to clog up, with you in it. If you've set TMC Delay Mode to 'Manual', SatNav will notify you of the traffic problem ahead, and the screen will ask you if you want to be Re-routed around the traffic jam before you get caught in it. You get to choose whether you want to go around it, or want to take your chances with a little slow traffic with no regrets.
If you set the TMC Route Mode on 'Automatic', SatNav will make the re-routing decision without you.
You won’t know WHY you’re being told to get off a perfectly good-looking road, and it may not seem logical to you---you’re simply being told “now, take the next right and get off this road”. You just have to trust that something just happened somewhere up ahead, which caused SatNav to kick you onto a new route.
If you set TMC Route Mode to “By Delay Time”, SatNav's decision to re-route or not re-route will be based on the estimated delay the traffic problem will (likely) cause.
IF you choose “by delay time”, you also have to adjust the next setting, to tell SatNav HOW LONG a delay you consider reasonable. A NYC driver like me doesn’t mind sitting in a traffic delay of 10 minutes, (but longer than that, and I start to feel trapped). So I set mine for 10, and SatNav will only re-route me if there’s a brand new traffic problem ahead that’s going to slow my trip down by 11 minutes or more.
…I have never tried driving with the TMC Route Mode set to OFF.