This app measures magnetic field and display the data as graph or map in units of nanotesla (nT; one nanotesla equals 10^9 tesla). Displays Z (downward component), H (horizontal intensity) and F (total intensity) of the local magnetic field vector. Note that continued use of GPS running in the background can dramatically decrease battery life.

CrowdMag alternatives

aprs.fi

This is the official iPhone and iPad application of aprs.fi, the favourite APRS web site of the amateur radio world. Obtain immediate, real-time access to current APRS position information, weather reports, telemetry graphs, and more. GPS is not required for viewing APRS information.

  • rating 4.06667
  • size 10.6 MB

Magnetic Storms

Magnetic Storms is an app that shows in near real time the condition of the Earths magnetic field regarding the solar particle emissions. Three parameters are showed: the Kp index, based in an array of magnetic observatories around the Earth, the X-ray solar flares and the protons and electrons flux based in satellite observations. The layout was adjusted and now it works perfectly in iPhone4S, iPhone5 (all), iPhone6(s) and iPhone6(s) Plus, iPhone 7 and iPhone7 Plus, and iPad2, iPad Retina, iPad Air, iPad Pro and iPad Mini.

  • size 21.0 MB

iOptron Polar Scope

This is an app to show the position of the Pole Star (Polaris in Northern Hemisphere, or Sigma Octantis in Southern Hemisphere) in the polar scope of all the iOptron(R) telescope/camera mounts. The app uses the best algorithm to calculate the position of Pole Star: The algorithm calculates 3D space motion of the Pole Star itself, precession, temperature and barometric pressure corrected atmospheric refraction, nutation, parallax, aberration, and etc.). NOTE: Since 2017/03/03, This app has the identical result as iOptron 8407, 8408 hand controller and iOptron Commander 5.4.

  • size 1.8 MB

Polar Scope Align

Polar Scope Align will calculate the position of Polaris or Octantis in your Polar Scope reticle for your location (using your phones GPS), allowing a quick and accurate polar alignment. It is one of the few programs that are accurate even in lower latitudes by correcting for atmospheric refraction (so expect results to agree only with precise software and not most simplistic polar align apps - see the Accuracy section in the website). The main reason for this is that while I intend to keep support for iOS 6/7 devices for as long as I am allowed, even for very few users, it adds an overhead so I should make sure it is really needed.

  • size 24.8 MB

Polar Scope Align Pro

Please note that the only in-app purchases available are tips. All functionality is included. The main reason for this is that while I intend to keep support for iOS 6/7 devices for as long as I am allowed, even for very few users, it adds an overhead so I should make sure it is really needed.

  • rating 5.0
  • size 29.2 MB