Garmin GPS shows where we've walked

Some years ago I bought a Garmin E-Trex GPS handheld device.  The main reason originally was to use it as a speed indicator for the boat, until I realised that the ordinary car satnav would work just as well in that role. It has many display options, not just speed. It gives average speed, distance covered, location and height, as well as times of sunrise and sunset etc.

One page gives a track of where it has been with a zoomable scale.  In the photo below the width of the display represents 1.6 miles; the pattern indicates the various paths and roads we have walked recently.  Our home is approximately in the centre.

There must be much more that the device is capable of, but I can't do more than the basics.I can't even operate Blogger now they've changed it.  Why is this all blue and underlined? It looks like a link, but to what?We passed this wintry-looking fishing lake on today's walk.