In JOSM... You can zoom to a point where the imagery is latest/good. Right click the background, and untick "Auto zoom imagery/background". Then you can zoom in for more fine detail without the imagery quality changing.
You can set an offset (On the menu, Imagery -> Offset -> New Offset, I think). A dialog appears asking for values, but you can left click & drag the background around. You can still right click & drag to pan around the world. Most mapping trips (at least an hour long) I align the imagery up based on an area where I have a grid of roads (e.g. at least 3 North-South and 3 East-West) to put it in a place where the traces are shown as on the road, I'll also pan to the other side of town and check I've got it aligned okay there. Maybe some trips (long distance A to B routes?) this isn't so helpful, but you could map car park lanes before you set off to get a trace suitable for aligning. -- Gregory [email protected] http://www.livingwithdragons.com
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