In cooperation with my good friend Jan we developed a collection of tools that help you with getting along with multi and mystery geocaches. The app is called GCTools and ready for sale! We plan to enhance the app time by time. If you miss something, let us know!  Here is a list of the current functionality:

Coordinates

• Projection of coordinates
• Distance between coordinates
• Intersection of lines
• Coordinate conversion (DMS, DM, D, UTM)
• Saving/loading coordinates
• Mapview
• Integration of GoogleMaps, OpenMaps and Navigon

De-/Encoding

• Caesar cypher (ROT-N)
• Alpha cypher
• Affine cypher

Interactive data tables

• Morse code
• Period system
• Latin/arabic numbers
• Coloralphabet
• ASCII table
• Resistors

Converters

• Lengths
• Areas
• Volumes
• Masses
• Speeds
• Times
• Temperatures
• Data sizes

• Flashlight

So check out GCTools on the App Store: