Doesn't access GPS data?!?!
Astonishingly, this app requires MANUAL input of lat/long! Why not just access the GPS data from the iPhone? That doesn't require the internet, only a view of the sky.
WMM PAL
Works well, very accurate. Thanks!

This app accurately calculates magnetic declination worldwide using the World Magnetic Model from NOAA. It has been updated with modern Swift and SwiftUI tools for improved performance and features.
V6.2
March 26, 2026
New version to allow updates to age ratings as per Apple policy. No other changes made.
$3.99
MyLocationToken
Autolocate feature
WMM PAL is an application that uses the World Magnetic Model developed by NOAA to determine magnetic declination accurately at any specified location on Earth. It has been updated with modern Swift and SwiftUI tools.
The app uses the World Magnetic Model from NOAA, which is designed for very accurate determination of magnetic declination at any latitude, longitude, and elevation globally.
WMM PAL is supported on iPhone, iPad, and iPod devices. It was originally developed using Objective-C and has been upgraded to Swift and SwiftUI.
WMM PAL is a paid application, priced at $2.99. There are no advertisements within the app.
The latest version, V6.2, was last updated on March 26, 2026. The app was originally released on July 11, 2015.
WMM PAL has an age rating of 4+, making it suitable for a wide range of users. It is developed by Digilog Corporation.
No, WMM PAL does not contain advertisements. It is a paid application that offers its features without interruption from ads.
The description does not explicitly state offline capabilities, but the core function of calculating magnetic declination based on location data suggests it may require an internet connection for real-time data retrieval or model updates. However, the World Magnetic Model itself is a dataset that can potentially be used offline.