A route typically incorporates one or more trails or trail segments. A trail user might walk on seven different trails to complete her route, and may or may not walk the full length of any of those trails to do so.
A point is just that: a single point, described by a single coordinate pair of latitude and longitude data.
The concept of a region is supposed to help the user know where to start looking for a trail, or where to upload a trail.
For example, a steep, narrow, winding trail might be best left alone by dog mushers, but be perfectly suited to snowshoers. In the summer, that same trail might well be useable by all summer users except horseback riders, due to the danger to the animal.
From a TrailMapper standpoint, 'Summer' includes springtime since the ground conditions are so similar.
'Winter' includes everything that 'Summer' does not.
'All_Season' means that for the shown user, time of year is largely unimportant.
A 'Class' of 5 indicates that the trail (or route) is highly developed. It might be an officially designated path, it probably gets routine maintenance, and is probably hardened, if not paved.
Many GPS's have a 500-point limit for tracks. So, if you upload a track to your GPS that you downloaded from TrailMapper, this number is significant to you.
If an uploaded datafile is known to have very few data points (say, 50 or fewer), you may well choose not to compress the file.
Additionally, if you download a file from TrailMapper and then reupload it, you should select the "No Compression" option, as the trail has already been compressed.
For those who are interested, the current compression algorithm is a lossy method, removing data points that do not change direction established by the last set of points, provided that the data points are not a large distance from the last pair. So, a very straight trail will have fewer datapoints than a very twisty trail.
When this layer is enabled, some placenames also are shown, depending on the zoom level.
A more complete help resource is available by clicking the "Help" button at the top right of any TrailMapper screen.