From Avenza Systems:
PDF Maps is a fast and powerful geospatial PDF, GeoPDF and Geotiff reader for your Apple iPhone, iPad and iPod Touch devices. Geospatial PDF maps are Adobe Acrobat PDF files that contain geographic information so that you can view real world coordinates. It renders maps quickly and features intuitive tools and multi-touch gestures for easy navigation.PDF Maps features and functions: Purchase and download professionally created maps from the Avenza Map Store. Browse and preview maps before downloading from categories including tourist, transit, and even topographic maps. Access and load maps through iTunes File Sharing, over Wi-Fi or cellular network and download documents to read any time (even offline) View your location on a PDF map using the built-in GPS device (iPad 3G+WiFi and iPhone) Download 1:24,000 scale USGS topographic maps for the entire United States Quickly view, zoom and pan maps using multi-touch gestures (pinch, drag and flick, double tap) Plot waypoints, change pin colors, edit position and label names, add notes, enter attribute data and add photos as attributes Search for places and points of interest on any map Use the compass to view true or magnetic north (iPad and iPhone) Export waypoints and associated attribute data to CSV, GPX or KML View the coordinates of the current position and any waypoint (latitude and longitude) and open it in the Maps app Measure distances and areasUnlike with streaming map apps, maps are stored on your device and can be used offline, which is great for travelers who wish to use maps outside of their home network or in areas that do not have network coverage.PDF Maps supports geospatial PDF files created by: Avenza MAPublisher and Geographic Imager ESRI ArcGIS MapInfo Professional TerraGo GeoPDF(R) Other software that support the Adobe geospatial PDF 1.7 specificationIt is recommended to run PDF Maps on iPhone 3GS or better, 3rd generation iPod Touch or better, or iPad for best results.
What's new in this version:
Pre-processed maps are now available for download from the map store. Small bug fixes and usability improvements.