To see the coding of the maps, instead of opening the mp file with GPSmapedit, use notepad to see the coding and also allows editing. Of course, to make the map back into a Garmin Mapsource file, I used GPSmapper.

I obtained a shape file from a state GNIS department which showed the boundaries of wildlife management areas, and added the boundaries as polylines. Garmin uses 3 map levels, so I paid carefull attention in assigning lesser features to the lower level(s). Then added the Mapsource gdb file and added the tracks and waypoints. Hikes and some off road trails were saved as tracks and other features were obtained as waypoints (if they were different then the Garmin map information) and stored and compiled in a Mapsource gdb file. I opened the original Garmin 24K map with GPSmapedit, and used this program to edit the map. S seems for the string format color and appearance and the Z for the zone/zoom level which are obviousely translated from the Garmin img binary format.ДЄs a National Map Corps Volunteer in the USA, I have been extensively hiking all of the trails and exploring the areas in this 24K Garmin map which is the same as the US Geological Survey 1:24K maps which is the maps that all of these USA map makers use. S seems for the string format color and appearance and the Z for the zone/zoom level which are obviousely translated from the Garmin img binary format. I guess the market is not very big in Europe for these because definitely the GPS can do better when I see all the possibilities available.Дo you have by any chance a table showing the coding of the formating data included with an item name ?Д®g with Mapdekode and Trackmaker: Hardwood I just began 4 days ago learning/playing with various tools but can see they did a sloppy job as they did not care to name lot of places, items, streams etc., just put generic names like 'stream' 'buildings' !ДЇormating, colors, zoom level are sloppy too. For the map sellers, providers, it's easier to sell then to make over new maps.Д¬urrently doing something similar but for french and belgian topo maps. I added it as a custom map to my unit, but loaded the surrounding 24K Garmin maps. Geog.) rely on current USGS information which is completly out of date. The map sellers (including Garmin, Magellan, DeLorne, Nat. In short, I've completely revised one 24K map to accurately reflect everything that is there.

I deleted non-existant trails, added trails not shown, added new jeep roads, added wildlife management area boundaries, corrected stream names, deleted non-existing features, added new features. This is a small pond in the Adirondack Mountains. Contour height levels are not shown becasue of zoom level but they are there. Can't remember which freeware program did the conversion. To be able to do trails you need to convert the Garmin file to a shapefile and then import into GPSmapper. Done properly, it is selectable in 'Mapsource' as a standard map and when in the unit can be toggled on and off. You could do the same having one 'overlay' that has your trails on it. The 'overlay is transparent and you can have it and city select showing at the same time. I can put 6 7.5 quads together, with contours, rivers streams and lakes, in about an hour. Nothing hard about it, just a lot of little steps where a simple error in a path statement causes the map to not load. Personally I would leave the Garmin maps alone.I make topo overlays for my favorite areas using GPS mapper.It is involved the first few times you do it with a steep learning curve. I have seen post in the past regarding map creation, quite a lenghty and complicated process but none to just modify existing maps. Has anyone experience or heard of means to modify Garmin Topo maps in order for example to add some path, names.

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