Useful for mariners, sailors for calculation related to navigation.
Different types of Calculations that can be done are as follows
Conversions
Celestial Navigation
Sailings
Distance
Time Zones
Weather Data
Log and Trig
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Simple Design
Thoroughly tested
Easy to use functionality
Compatible with all your ios devices
Disclaimer:
Continuous use of GPS will reduce the battery life drastically.
Wifi or internet connection is required to use map services.