No offence taken, I simply phrased the post wrong. Hopefully this one isn't worse

Alright:

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I don't know wether it is possible to make, but perhaps it's possible to use a small map with 15*15 pixel tiles for the overview and use a 200*200 pixel per tile for the zoom map, the user can see either all tiles unzoomed or 1 tile zoomed). One zoomfunction and two maps.

An alternative might be a popupbox where the user can optionally enter an exact coordinate (within the range of that (sub)tile!) for a placed unit which overrides the pixelcoordinate, thus the map will become an approxiamation of what one will get. This will already be a major improvement over editing in wordpad.
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I like both of these ideas. The second one is a snap, first one might cause difficulties. It should be acceptable never the less. Having a big map in the first place and scrolling is probably easier. And I would perfer personally to work in a more free mode like that. However, would it be too big to allow for effective distance preception anyway? I wouldn't want to scroll a mile to get to the other side if I had an mini map alternative showing rough locations giving me the ability to zoon on them.
I just thought about somthing for making presise maps, I know you can zoom/stretch/expand detail in the mini map. Why not take a sceen shot and using that as the image.

I was wondering if you might want to make a rough sketch of the best possible UI? There are many ways to put its face together, so I think it would be most benifitial for a actuall user to make it. Ie. One might involve tabs, MDI, SDI windows and so on, then there would be many options for what kind of icons buttons and windows controls would be used, where and for what.

Time will tell