XHiRes pack

This is the extract of information from the EOTopo webpage:

WHAT IS THE DIFFERENCE BETWEEN THE LORES, HIRES & XHIRES?
The LoRes pack contains the map data for levels 1-9. HiRes contains map data for levels 9.1-12 but will allow zoom at full resolution to level 18. XHiRes adds the remaining detail for levels 12.1 - 18. This XHiRes pack might be considered optional for those that would prefer to avoid using the additional 2GB of storage that the XHiRes will require. This is personal choice. TIP: the type of map data in the XHiRes include minor fine detail that only appears above Level 12 showing buildings as well as all "short" roads/tracks including walk paths, bike tracks, bridle trails, unsealed roads/tracks in both residential and non-residential areas. The definition of "short" refers to 0.001 degree (approximates to 111 metres). Therefore if the road/track is less than 111m at the zoom scale you are viewing, it will not appear unless you have XHiRes map pack installed. It is recommended that if you have the available storage space that you should include the XHiRes download.

You can view sat maps offline BUT you will have to use google maps, it’s not a particularly effective result though, youtube will give you some tips

XHires gives you mapping detail down to individual house numbers while off line. You don't get images or satellite view, but you do get a very detailed map.