You wont get the map without a data connection, but you should get the gps coordinates on a blank white map.
There's also an option to save an area of the map for offline viewing, which means you can select quite a large area at home, download it over wifi and it saves the maps onto your sd card so when you're in the middle of nowhere you can view the maps with gps and no data
Zoom out the map to roughly the area you want to save (can be quite large like 30*30 miles or something), hit the menu button, "make available offline", select the area of map you want to save for your cycle rides, then it should download it and youll be able to find it later either by hitting the maps button top left, going to favourites and then the offline maps tab, or i think hitting the 3 layer icon bottom right and choosing "my maps". It wont use data and will still show you where you are on the map from gps. That should be right, i can check properly if its not