Version 2.3 of Topo Maps+ is now live on the App Store and it has a beautiful new map from CalTopo. This map has high resolution USGS maps and much better maps of Canada from geobc and NRCAN. The Canadian maps cover southern and western Canada. The USGS maps now include Alaska and Hawaii.
To use this new map tap on menu (upper left corner), then Map Type, and then select the CalTopo map.
Here are some sample of the USGS topo maps from CalTopo.
And here are some samples of Canadian maps from CalTopo.