Frequently asked questions about FriesNav.
Yes. After a one-time download of a chart pack, the whole chart works fully offline — handy on the water, where coverage is often poor or absent. You only need internet to download or update the chart.
Open Settings (the gear icon, top right) and choose “Download for offline use” for the chart you want. After that you can use the app without internet.
The Frisian sailing waters: the Frisian lakes, the Wadden Sea off Fryslân and the IJsselmeer coast. The Markermeer is outside the current coverage.
Depth surveys come from the Province of Fryslân, buoyage and waterway information from Rijkswaterstaat (IENC), and bridge operating times from sources including waterkaart.net. Full attribution is available in the app under Settings → “Bronnen & licenties” (Sources & licences).
Check that you have granted FriesNav location access (iOS Settings → Privacy & Security → Location Services → FriesNav → “While Using the App”). FriesNav uses no background location, so your position only appears while the app is open.
No. FriesNav is free, with no in-app purchases, no subscription and no ads.
No. FriesNav is an aid for recreational boating. Always consult official nautical charts, current notices to mariners and your own visual observation. You remain responsible for safe navigation.
Please let us know — missing buoys, incorrect operating times or other issues all help us improve. Send an email and include the location.
Email friesnav@huernink.com