The 1.5 version of Topos US for Mac is available as a free download on our website. The following versions: 1.4 and 1.2 are the most frequently downloaded ones by the program users. This Mac application was originally developed by Pignology, LLC. This Mac download was checked by our antivirus and was rated as virus free. This app's bundle is identified as net.pignology.Topos-US. The program lies within Education Tools, more precisely Reference.
From the developer:
Topos US is an app that provides access to download and view high resolution USGS topographic maps for the United States.
REGARDING MAP DATES:
You will often see a date on a downloaded map that seems pretty old. This is the date of last physical survey. This could be a long time ago. Often maps will be compared to aerial photography to verify buildings but not always. I can't do anything about this and besides, mountains don't move that quick.
You may want to check out more Mac applications, such as TOPO! Explorer, which might be related to Topos US.