On Google maps I can zoom with the mouse wheel and pan/scroll by holding down the left mouse button, or the wheel.
On BaseCamp I seem to have to move the mouse pointer off the map and select either the zoom button or the pan/scroll button. A real pain compared with the Google experience when following a long route on the map with frequent zooming in and out and scrolling. Or have I missed something?
Aaaaah, just found the secret: stay in the pan/scroll mode, then it is possible to zoom with the wheel without leaving that mode. Sorry for the waste of bandwidth
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Bryn