daddywpb: Interesting question, by the way I always appreciate your questions because I learn something about my gps units in the process. I do not know if some of the menus for the Legend C and the 76C are the same. I suspect that many process are shared with the Legend C, the 60C, and the 76C.
When I first worked with the 76C I noted the bread crumb trail was not as defined as it was the my old gray scale Legend. There is a location that I walk the dog that I repeat my tracks a number of times and the bread crumb trail became clearer. ( I must admit that I am looking at the this trail with old eyes. When I zoom in the trail is clearer.) Because of your question I went to the Track Page. From there I went to Saved Tracks>I noted there was a >Color>option> There are numerous color option. Take care on option is Transparent. I have not tried Transparent. My unit was set for Magenta, what is okay, but I switched to black. I will experiment with that. >Another option on the page was an unchecked box labeled "show on screen." I checked the box, so now I need to take a walk and see what changes I observe. I noticed on the screen that my saved Trac Bac showed up clearly. But there was another option on the bottom of the screen. A "white" arrow on showed up on the screen and at the bottom of the screen in small black letters with a blue background was the message, "Select the point you want to TracBack to. It works.
A couple of things happen to the 76C. I get a pop-up screen showing the route and get a "tone" if I need to make a turn or I am a location. This is part of the auto routing system.(When out hunting I would shut the tone off.) When in the proper Trac Bac mode the compass arrow points the direction of the Trac Bac that has been saved, and then selected.
I found that the transition from my older Blue Legend to the 76C rather easy regarding the basics. The kicker is that the new color series units offer more screens and other options on top of the old. With more options the learning curve just grew a little bit.
Lately I have been out re-walking the same route with a friend who had hip replacement surgery. At times I wonder what the neighbors think about the two old guys going up and down the street staring at something in there hands, and with a line going back to their neck. Of course it is our gps units, and we are playing with tracks, satellite reception, Trac Bac, and other options. Knowing that my friend had surgery recently another neighbor asked if my friend was wearing a heart monitor? :-)
Time to take the dog for a walk.