Nautical angle calculator
This calculator is used to add and subtract angles in the form used in the
Nautical Almanac 
a publication with data used for navigation by ships.
The angles in this publication are expressed in degrees in the usual way (0° to 359°),
each degree is divided into 60 minutes, but each minute is divided into ten decimals (and not into 60 seconds).
 Thus: 34° 59.9' is read as 34 degrees 59.9 minutes.
 and: 34° 59.9' + 0.1' = 35° 00.0'
Instructions
The calculator adds or subtracts input values from the running total in the top window.
 Enter a value in two parts: the degrees in one field and minutes in the other.
 Press Enter. The input value will be entered into the running total, replacing whatever was there. Or:
 Press either the Plus or Minus button to add/subtract the input from the running total.
Accuracy
The decimal part of the minutes output is rounded to 1 decimal place to be consistent with navigation practice.
However, the internal result is kept to the highest possible precision so that
successive operations do not produce a cumulative error.
Automatic conversion to Degrees  Minutes  Seconds
Whenever the calculator outputs a new result it also displays it in the Degrees  Minutes  Seconds format just below the main display window.
See also Degrees  Minutes  Seconds angle calculator.
Other angle topics
General
Angle Types
Angle relationships
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