Marine navigation on the iphone, with free downloadable NOAA raster charts.
"Memory-Map's charting app handles NOAA raster charts and topo maps with speed and smoothness I didn't think possible", says Ben Ellison on Panbo.com.
"One of the cleverest bits of thinking and programming we've seen for handheld instruments." Practical Sailor, April 2010.
+ Import and export GPX files
+ Wide range of maps and charts for many parts of the world
+ Auto-rotate screen (can be locked in preferred orientation)
+ Screen lock to prevent accidental touches while recording a track
+ Shows speed and direction of travel, even at slow speeds
+ Support for GPS and Compass sensors, where available.
+ Placename index
+ Moving map, lock GPS position and automatically scroll the map
+ Records tracklogs.
+ Create and edit marks, which may be linked to a web URL
+ Plan routes, measure distances and bearings
+ Lat/Long, UTM and British National Grid coordinate systems
+ Email position marks or tracklogs as GPX files
Battery Use Disclaimer: "Continued use of GPS running in the background can dramatically decrease battery life."