I've noticed that for some locations, such as Tbilisi Georgia where I am now, that both Google Maps and OpenStreetMaps have incomplete data but with different omissions.

It would be really nice to be able to see them overlaid on one another so I can do things like zooming in on something in the Google satellite image to know I have the right spot on OSM.

I was sure I stumbled across a site that did just this once but now that I need it I can't seem to find it or anything like it via Googling.

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Do you really mean overlay or just want the option to toggle them on and off? – R.K. Jan 24 at 8:58
Ideally with transparency/translucency, which is what I thought I found once, but toggling rapidly between both aligned perfectly in the exact same spot at the exact same scale would be a close second best! – hippietrail Jan 24 at 9:03
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You might want to try GISCloud. It lets you create your own maps and publish them. Supports layer transparencies, too. You could add a Google Map and OSM layer and set the transparency of one of them to 50% or whatever level you prefer.

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I can't seem to find any maps there of Tbilisi or Georgia. Maybe I was doing it wrong though... \-: – hippietrail Jan 24 at 16:26
Ah, you can make your own map :) – R.K. Jan 25 at 12:20
Yes I tried that now too but for some reason only the Google Map showed up and the OSM seemed totally blank no matter what I did \-: – hippietrail Jan 25 at 12:24
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