Instantly compare observed celestial navigation altitudes with calculated ones. This app helps mariners detect GPS spoofing and functions as a celestial navigation trainer. It automatically includes all necessary corrections for accurate readings.



8+ similar apps compared and reviewed
Contour is great, but it's not the only option. Explore 8+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.



Instantly compare observed celestial navigation altitudes with calculated ones. This app helps mariners detect GPS spoofing and functions as a celestial navigation trainer. It automatically includes all necessary corrections for accurate readings.



Visualize legal land boundaries and section names overlaid on a satellite map. Search for specific land sections using their legal designations. Supports numerous US states and Canadian provinces.





This app allows you to view and convert KMZ files, which are used by Google Earth to display placemarks, images, and other geographic data. It supports both online and offline use, with multiple methods for importing and exporting KMZ files.


This app provides advanced field coverage tracking for agricultural professionals. It visualizes worked areas in real-time, helping to save fuel and time by minimizing overlap and missed spots. Features include comprehensive statistics, smart route planning, and an easy-to-use interface.


This app provides advanced terrain analysis and 3D modeling tools for geospatial tasks. Visualize land features, analyze slopes, and generate elevation models with AI-powered insights. Seamlessly export data to industry-standard formats for professional use.


Access detailed USGS topographic maps and satellite imagery for offline use. Track your hikes with distance, elevation, and calorie data. View various data themes like trails, hydrography, and land cover.


This app provides detailed offline 3D topographic maps of the entire USA. It includes terrain, roads, water bodies, and landmarks, functioning even without a cell signal. It's ideal for navigation and emergency situations where connectivity is unreliable.