Online Mapping
The Online Map is very versatile control, with some useful properties. It uses maps sourced from an online map-provider, so you will need an internet connection to use it.
You can choose the Map Provider from one of a number of possibilities: Bing Hybrid Map, Bing Map, Bing Satellite Map, CloudMade Map, Google Hybrid Map, Google Map, Google Satellite Map, Google Terrain Map, OpenCycle Landscape Map, OpenCycle Map, OpenStreet Map, OpenStreet Map Quest Hybrid, OpenStreet Map Quest, Wiki Mapia Map, Yahoo Hybrid Map, Yahoo Map, Yahoo Satellite Map, Yandex Hybrid Map, Yandex Map, and Yandex Satellite Map. Not all of them will work all of the time (this is outside of my control, as it relies on external map-providers who can change their policy at short notice), but there should always be a good selection of those that do. I prefer Bing, as the refresh rate and tile-update time is one of the quickest.
Select which one you want via 'Config > Set Program Options> Mapping'. The Map-Fill transparency setting, on the same Options page, refers to when a polygon is plotted on top of the Online Map, so you can choose how transparent that color is, and how much of the map you want to see underneath the colored polygon. Note that '0' is fully transparent, and '255' is fully opaque.
The Online Map has a right-click Context Menu, with a variety of commands. You can find out about this in the 'Mapping Right-Click Context Menus' help-page.