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.
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.
magnetic compass can be inaccurate due to magnetic anomalies,
deviation, and other factors. Star bearings take all the guess-work
out of it.
from the Google and Amazon App Stores. Updated Nov 20, 2018.
read the DISCLAIMER below, before using for navigation.
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.
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.
shows the Sun, Moon, 5 planets, and 128 stars.
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.
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.
here is the panel to input your assumed latitude. Other panels are used
to input assumed longitude and magnetic variation.
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
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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.