Thread: Garmin GB Discoverer v3.00 - National Parks 1:25K and National Trails 1:25K Collection

You are right, I just looked at it again (I made those maps almost 2 years ago) and I was wrong in stating I removed the 50k layer from the 25k maps! Actually it's impossible for me to remove this layer because after deleting the 67 vector maps (used for autorouting) and the mdr.img there is only one img left in the Parks- and Trail maps. It appears to be a 2 level map containing both 25k + 50k bitmaps.
When I made these joined maps I examined the single bimap img in Basecamp and only saw 25k scale bitmaps. Now that I looked again in Basecamp I found that when Basecamp is set to display at the highest level it only shows the 25k layer at all zoomlevels, only when you set detail to high or higer the 50k layer shows up when zooming out!
It never struck my eye because I always have the full 50k map enabled because it covers the entire UK. The full 50k map also contains a basemap on a larger scale which becomes visible at 1.2km.

Conclusion: there still is some overlapping (Trails and Parks are overlapping too offcourse) data but I can't remove it ;-). I would advise to always enable the full 50k map because this map provides the 50k portion outside the Parks and trails, the search index, the basemap and the autorouting maps.