Depthly vs AboveSea

Know how deep the water is before you get there. Depthly turns your iPhone into a pocket depth chart for the sea. Aim the crosshair anywhere on the map, tap once, and read the depth of the seabed at that exact spot. No sonar hardware, no cables, and nothing to install on your boat. BUILT FOR PEOPLE ON THE WATER Whether you sail, fish, cruise, paddle or dive, the question is always the same: how deep is it here? Depthly answers it in one tap, using published bathymetric survey data that covers seas around the world, with especially detailed coverage of European waters. TAP TO SOUND Take a sounding anywhere on the chart. Every measurement is saved as a pin with the depth, the exact position in decimal or degrees and minutes, the nearest place name and the time it was taken. Build your own private chart of the places that matter to you: anchorages, fishing marks, shallow passages, dive sites. DEPTH CONTOURS ON ANY MAP Generate depth contour lines for the area on your screen, at the interval you choose, drawn over a marine chart, a satellite view or a standard map. See at a glance where the bottom shelves, where the deep channel runs and where it gets thin. SEABED PROFILES Pick two points and Depthly draws the cross section of the seabed between them, with the total distance, the deepest and shallowest points and the average depth. Perfect for checking a passage, planning a dive or understanding a fishing ground. WORKS COMPLETELY OFFLINE Download the chart and the depth data for a whole cruising area before you leave the marina. Out on the water, with no signal at all, soundings, contours and profiles keep working exactly as they do at home. Your charts do not need the internet once they are on your phone. RECORD YOUR TRACKS Record your route while you are underway. Depthly logs your position and fills in the depth beneath you along the whole track, even if you were offline at the time. Review the track later on the map, see the seabed profile under your route, and keep a log of every trip. TAKE YOUR DATA WITH YOU Export tracks and seabed profiles as GPX or CSV files that open in chartplotters, mapping tools and spreadsheets. Depths are written the way chartplotters expect, so your recorded data slots straight into the rest of your navigation setup. TRUSTED SOURCES Depth data comes from EMODnet Bathymetry and GEBCO, the leading public bathymetric surveys. Depthly is a planning and reference tool: always use official charts and your own judgement for navigation. FREE TO USE, PRO IF YOU WANT MORE The free version includes five depth soundings every day, all map styles and unlimited track recording. Depthly Pro unlocks unlimited soundings, depth contours, seabed profiles, offline areas, GPX and CSV export and iCloud track sync. Pro is available as a monthly or annual subscription, or as a single lifetime purchase. The annual plan starts with a seven day free trial. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period, and can be managed or cancelled in your App Store account settings at any time. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://blayasoft.com/privacy.html Drop a pin on the sea and know what is under it. Download Depthly and take your first sounding today.

Explore approximate terrain elevation above sea level and the depth of seas and oceans. Move the map: the number under the crosshair shows the elevation of the selected point on land or the depth of the sea floor. FEATURES • Terrain elevation and sea depths on the map • Mountains and valleys in 3D • Compare two points: elevation difference and straight-line distance • Search for cities, addresses and coordinates, including degrees, minutes and seconds • View your current altitude from iPhone location services on a separate screen • Save your own places on your iPhone • Meters or feet, light or dark appearance DATA ACCURACY Map elevation comes from a terrain model; sea depths come from bathymetric data. Values are approximate. When zoomed out, values are rounded or the app asks you to zoom in. Narrow summits may be smoothed in the model. Your current altitude from location services is shown separately and can differ from the surface elevation, for example on a bridge or on an upper floor of a building. PRIVACY No registration or advertising. Saved places stay on your iPhone. You can browse the map without granting location access. AboveSea is a reference tool. Do not use it as a surveying instrument, an aviation altimeter or a tool for emergency navigation. Map data © Mapbox © OpenStreetMap contributors. Sea depths: GEBCO Compilation Group (2026) GEBCO 2026 Grid.