Admiralty Magnetic Variation Chart 5374: The World - 2025 and Annual Rates of Change Folds:Folded Porthmadog (1 : 10

Porthmadog (1 : 10

Updated depth surveys have been included where applicable

4 Burriana to Cabo de Irta

L’Elorn – Continuation to Landerneau (1 : 80

There has been general updating throughout

Admiralty Magnetic Variation Chart 5374: The World - 2025 and Annual Rates of Change Folds:Folded Porthmadog (1 : 10An official Admiralty Magnetic Variation Chart, printed on demand on quality, watermarked chart paper directly from the UKHO's latest digital files. Each chart includes the most recent magnetic variation data and annual rates of change for accurate compass correction and navigation. About Admiralty Magnetic Variation Charts Admiralty Magnetic Variation Charts are essential reference tools produced by the UKHO showing the angular difference between