This is a quick look at NavPak Star Compass with screen shots. This edition of NavPak is for watches running Android 6.0 or later. Requires 400 x 400 minimum screen resolution.

This app provides a 360 degree panoramic view of the sky where you can get accurate and reliable bearings from the stars and planets. It is also useful to identify stars, planets, and constellations. This is a free beta app enabled through 2019.

A magnetic compass can be inaccurate due to magnetic anomalies, deviation, and other factors. Star bearings take all the guess-work out of it.


Available free from the Google and Amazon App Stores. Updated Nov 20, 2018.

Please read the DISCLAIMER below, before using for navigation.




Raster View


Rotate the celestial sphere by tapping on the left or right side of the screen. Tap again to stop. Using the slow rotation, you can precisely align the celestial body on the center-line of the screen. Tap to stop, and there is the bearing. In the example, we can see that the Moon is at 139 degrees Magnetic, and it is about 33 degrees above the horizon.


The names of the brightest Selected Navigation Stars are shown in yellow (first magnitude). The next brightest Selected Stars are shown in orange (second magnitude). Other Tabulated Stars are shown in red. Constellation names are shown in gray.




NavPak shows the Sun, Moon, 5 planets, and 128 stars.


The Vector View shows the names of the stars and planets. The Selected Navigation Stars are generally the brightest and are shown as bright yellow. The names are the Proper Names in English. Other Tabulated Stars are shown a little dimmer and their names are a Greek character with a 3 letter abbreviation of the constellation. These are standard Bayer designations. NavPak has 128 stars, which includes the 57 Selected Stars, Polaris, and most of the other stars brighter than 3.0. The exceptions are where a tabulated star is very close to a much brighter Selected Star.




Main Menu Screen

SETUP:
Set your magnetic variation and assumed position, and be sure that the correct GMT is shown. Enter the magnetic variation to the nearest whole degree. Enter position latitude and longitude to degrees and decimal minutes. For simplicity, you can set the position (latitude and longitude) to the nearest whole degree, and the resulting bearing should be within 1 degree.




Input Panel:

Shown here is the panel to input your assumed latitude. Other panels are used to input assumed longitude and magnetic variation.

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 App Stores. Please let us know if you have any questions or comments. Thanks for watching.


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DISCLAIMER: 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. A few dozen planetary positions were compared with the Air Almanac for 2018, with good results.