Markline: Benchmark Hunting
Find and log NGS survey marks
About
Discover and log U.S. survey marks offline with a catalog of over 793,000 entries. Track your findings, view mark details, and get directions to nearby markers. Ideal for hobbyists and professionals interested in geodetic control.
What's New in Markline
1.1.13
October 27, 2026
Bug fixes and improvements.
Subscriptions & In-App Purchases
$3.99
Markline Unlock
Permanent field guide access. No subscription.
Developer apps
FAQ
Does Markline have ads?
Markline is ad-free, allowing for an uninterrupted user experience while you are out in the field.
How much does Markline cost?
Markline offers three days of full access for free. After the trial, an optional one-time unlock is available for continued access. The app is listed as 'Free' with in-app purchases.
Is Markline available on all devices?
Markline is available on macOS, iPhone, and iPad, providing flexibility for users across different Apple platforms.
How often is Markline updated?
The latest version of Markline is 1.1.13, and it was last updated on October 27, 2026, indicating regular maintenance and potential feature additions.
Can I use Markline without an internet connection?
Yes, Markline is designed to work offline. The extensive catalog of over 793,000 U.S. survey marks is bundled within the app, requiring no signal or server connection.
What kind of information does Markline provide about survey marks?
For each mark, Markline provides details such as type, setting, coordinates (DMS + decimal), elevation, datum, stability, satellite use, and recovery history.
How does Markline handle user privacy?
Recovery status, dates, notes, photos, and settings are stored locally within the app. Users can choose to export backups or share recovery cards, with the destination handling the content under its own terms.
What is the age rating for Markline?
Markline has an age rating of 4+, making it suitable for a wide range of users interested in outdoor exploration and data collection.
