Today I have updated the downloadable checklist to revision 3. This latest version contains nearly 50 amendments to the first version that was released in 2018.
The site has supported map locations since day one, but nothing beats looking at a postcard's location from the same spot today. A recent enhancement to the site allows this, showing the approximate view point on a Google Street View. Finding the correct view requires manually checking unfortunately, so adding the views to all the cards is likely to be a long process.
Some cards have the view added already, and for these cards the map can be switched between the top-down map view and the Street View by toggling the buttons above the map.