This is a quick look at NavPak Calculator for Watches, Phones, and Tablets. This calculator should run on most devices using Android 6 or later. It may run on some devices with Android 5. It requires a screen of 360 pixels wide or greater.

It is a general purpose calculator with a few features for Navigators, in particular degree and minute entry, nested and series parenthesis, 8 memory registers, and trig functions.

Available free from the Google and Amazon App Stores. Updated June 3, 2019.

Please read the DISCLAIMER below, before using for navigation or general use. This is a Beta Test release.


This is the main Calc Panel.

It operates like a simple calculator using the buttons on the right side. The buttons on the left lead to additional features.


This shows the nested and series parenthesis, trig, square, and square root functions. The auto-complete feature will add the missing 2 parenthesis at the end of the equation.



This is the Log Panel.


It saves the last Equation and Answer. To get here, tap the (L) button on the main panel.


When you solve an equation, by tapping the Equal button [ = ] then the last Equation and Answer are updated. Using the Insert button [INS], you can insert the answer in your next equation.


The equation shown here is an example of the terrestrial triangle used in navigation to measure the distance between 2 points.


This example shows the distance between 1.0 N 1.0W and 2.0N 2.0W, degrees.


To get the distance in degrees, subtract the result from 90. In this example, 90-88.587185=1.412815 degrees. To get Nautical Miles, multiply the degrees by 60. In this example, 1.412815 X 60 = 84.7689 Nautical Miles.



This is the Function Panel.

To get here, tap the [F] button on the main Calc Panel. When you select a function, this panel will close, and it will insert the function in your equation.


This is the Conversion Panel.


To enter a number, you can use the keyboard [KB], or a number stored in Memory [M], or if you have a result shown on the main panel, it will carry over to this panel.



After entering a number, select the Input Units, then the Output units, and the Output value will be shown. You can insert the result in your equation, using the [INS] button, or you can save it to Memory using the [M] button.


This is the Input Panel for degrees & minutes.


You can insert the result in your equation, using the [INS] button, or you can save it to Memory using the [M] button. You can change to sign with the ( - ) button.


To use this, tap a number on the keypad and it will be shown in the Scratch Pad Area (yellow), Then tap [Deg] or [Min] to enter it in the panel.

You can insert the result in your equation, using the [INS] button, or you can save it to Memory using the [M] button.


This is a sample equation showing 2 different methods to use the percent function.


In this example 10%100 = 10, and 10+10%=11. You can multiply, divide, add, and subtract percentages, such as

100x10% = 1000 or

100/10% = 10.


This is the Memory Panel (1 of 2) showing the Memory Registers.


Each register has a [MS] button to store the value, and it has a [MR] button to recall the value.


if you have a result shown on the main panel, it will carry over when you open this panel, and it will show at the top. Tap [MS] to save it to storage.


You can also enter numbers using the keyboard. To get the keyboard, tap [KB].


This is another sample equation showing the Pythagoream Theorem.


To help readability, different colors are used for numbers, operands , functions, and parenthesis.


The Log panel shows the result of the Pythagoream equation.










Always Under Construction.

Look for new items on the menu every now and then. New features will be published here first. Available in the Amazon and Google AppStores. Please let us know if you have any questions or comments. Thanks for watching.




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DISCLAIMER: We can not be responsible for any loss or damage incurred by using this calculator. We have tested it in house and it appears to be bug free.

In the ancient tradition of navigation, do not rely on a single aid to navigation. Before going offshore, you should have a hard copy of essential navigation materials. This program should be useful for celestial navigation, but this initial release has not been extensively tested, so please be careful.