You can consume Nearmap data in a variety of ways. Within MapBrowser, for example, data is consumed when new tiles are downloaded from Nearmap's servers. The bigger your monitor, the more tiles you can fit in view and therefore the more data you will consume. However, once you are zoomed out below zoom level 14, no matter how much panning or how big your screen is, we won't count data.
Find out what does and does not consume data in this article:
About Data Usage