Sources and licences

Map data, positions and places nearby: OpenStreetMap

ODbL 1.0

The map and the “Nearby on OpenStreetMap” items use data from OpenStreetMap, © OpenStreetMap contributors, available under the Open Database License (ODbL). Our own listings and OpenStreetMap data stay in separate files. Where a stop or mooring has no position of our own yet, our map files take its point from OpenStreetMap: those features say position_source “osm” with the feature’s osm_ref, and the file carries the ODbL notice (© OpenStreetMap contributors).

© OpenStreetMap contributors · Open Database License (ODbL)

These layers are also built from OpenStreetMap data, each published apart from our own listings:

• Positions: a stop or mooring without a GPS fix of our own takes its position from OpenStreetMap (“Position: © OpenStreetMap contributors”), shown with “Not yet checked on site”.
• Harbours & marinas from OpenStreetMap: marinas, harbours and named piers that are not in our listings, labelled “access not checked”.
• The route network of the trip planner: navigation lines, canals, rivers and locks, derived by Jetty Hop. Every result is an estimate, not for navigation. “Route network: © OpenStreetMap contributors (ODbL 1.0), derived by Jetty Hop”

  Lough Derg planning line: Navigable waters © Waterways Ireland, via EPA, CC BY 4.0. Selected, clipped and adapted using OpenStreetMap lateral marks. Approaches and depths are unverified. The combined route database is distributed under ODbL 1.0. Source · CC BY 4.0

• The waterway areas and the outlines of the offline map packs. “Areas derived from © OpenStreetMap contributors (ODbL)”
• The coastline and lake outlines of the small maps on the waterway and stop pages.

Data files (ODbL): positions.geojson · network.json · waterways.geojson · Lower Shannon: Killaloe to Limerick · Lough Derg · Middle Shannon & River Suck · Lough Ree · Upper Shannon: Lanesborough to Carrick · Boyle River, Lough Key & Lough Allen · Shannon–Erne Waterway · Upper Lough Erne · Lower Lough Erne · Grand Canal · River Barrow & Barrow Line · Royal Canal · Lough Neagh & Lower Bann · Lough Corrib

Map tiles: Protomaps

ODbL 1.0 BSD-3-Clause OFL 1.1

Our credit line, quoted in English as we publish it everywhere.

Map tiles: Protomaps basemap, daily build 20261022 (OpenStreetMap data of 22 October 2026), © OpenStreetMap contributors (ODbL), style © Protomaps (BSD-3-Clause), fonts SIL OFL 1.1, icons MIT.

We host our own copy of the tiles; Protomaps asks people not to link to its builds directly. Map rendering: MapLibre GL JS.

Protomaps · protomaps/basemaps · MapLibre · © OpenStreetMap contributors

Navigation marks and routes

ODbL 1.0

The map’s “Marks & routes” layer shows navigation marks from OpenStreetMap (© OpenStreetMap contributors), published under the Open Database License (ODbL), apart from our own listings. Marks may be incomplete or out of date and are not for navigation. No routes are drawn yet. Any route we add will be credited “Routes: Jetty Hop” and will show a typical line or a recorded track, not a safe channel or the depth.

© OpenStreetMap contributors · Open Database License (ODbL)

Data files (ODbL): Lower Shannon: Killaloe to Limerick · Lough Derg · Middle Shannon & River Suck · Lough Ree · Upper Shannon: Lanesborough to Carrick · Boyle River, Lough Key & Lough Allen · Shannon–Erne Waterway · Upper Lough Erne · Lower Lough Erne · Grand Canal · River Barrow & Barrow Line · Royal Canal · Lough Neagh & Lower Bann · Lough Corrib

Weather forecasts, warnings and the lakes forecast: Met Éireann

CC BY 4.0

Point forecasts, weather warnings and the inland lakes forecast are Met Éireann data, used under the Met Éireann Custom Open Data Licence (CC BY 4.0 plus the duty to show current warnings). Warnings are shown wherever we show forecasts, unaltered, with expired warnings removed. Met Éireann does not endorse this guide.

Required wording, quoted in English as published.

Copyright Met Éireann Source www.met.ie This data is published under a Creative Commons Attribution 4.0 International (CC BY 4.0). https://creativecommons.org/licenses/by/4.0/ Met Éireann does not accept any liability whatsoever for any error or omission in the data, their availability, or for any loss or damage arising from their use. This material has been modified from the original

Modifications by Jetty Hop: wind speeds converted to knots and Beaufort force, hourly values summarised for display and combined with other data, weather symbols redrawn as our own icons, a guide wind advice badge calculated by us. Met Éireann weather warnings and the inland lakes forecast are shown unaltered.

Met Éireann Custom Open Data Licence · met.ie open data · met.ie/warnings

Weather warnings for Northern Ireland: Met Office

© Crown copyright

For the waterways in Northern Ireland and across the border we show the Met Office’s warnings for Northern Ireland from its RSS feed: unaltered, each with its own link, next to Met Éireann’s warnings for the counties in Ireland. The Met Office does not endorse this guide.

Our credit line, quoted in English as we publish it everywhere.

Weather warnings for Northern Ireland: Met Office, shown unaltered from its RSS feed. © Crown copyright. Source: Met Office (https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings).

Met Office warnings

Water levels: Office of Public Works (waterlevel.ie)

CC BY 4.0

Required wording, quoted in English as published.

Contains Irish Public Sector Information licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence (source http://waterlevel.ie and http://waterlevel.ie/hydro-data/ - provided by the Office of Public Works).

Data is provisional, unchecked, and has not been validated to remove invalid or improbable values. Data may be inaccurate due to instrument errors, malfunctions or physical changes at the measurement site. Data may be delayed due to telemetry issues or system malfunctions. Data is provided on a best efforts basis - the OPW will endeavour to maintain data availability, but does not guarantee continuity of services. … It is the responsibility of the user to ensure that the data, if used, are accurate and fit for purpose. The Commissioners of Public Works will not be responsible for any loss or damage howsoever arising from the use or interpretation of the data …

Full OPW disclaimer · waterlevel.ie · CC BY 4.0

“Low / normal / high” bands are calculated by Jetty Hop from OPW data and are not OPW thresholds. Not for navigation.

The gauges we show, each linked to its own page on waterlevel.ie:

Lower Shannon: Killaloe to Limerick

Limerick Dock · Ball’s Bridge

Lough Derg

Portumna Bridge · Meelick Weir

Middle Shannon & River Suck

Athlone · Shannonbridge · Athlone Weir U/S · Derryholmes · Banagher · Victoria Lock · Meelick Weir · Ballinasloe Town

Lough Ree

Derry Bay (Lough Ree) · Hodson's Bay · Athlone Weir U/S

Upper Shannon: Lanesborough to Carrick

Jamestown · Drumsna · Carrick-on-Shannon

Boyle River, Lough Key & Lough Allen

Blackrock Lock · Boyle Abbey Bridge

Upper Lough Erne

Belturbet · Foalies Bridge

Grand Canal

Derryholmes

River Barrow & Barrow Line

Levitstown · Carlow · Royal Oak · Graiguenamanagh U/S · St. Mullins

Lough Corrib

Annaghdown Pier · Cong Pier · Angligham · Galway Barrage

Water levels in Northern Ireland: DfI Rivers

We do not show water levels from the Department for Infrastructure (DfI Rivers) in Northern Ireland. Its level pages for Lough Erne and Lough Neagh carry a use limitation, so we only link to them until we have permission.

Lough Erne levels (DfI)

Marine notices and lock times: Waterways Ireland

© Waterways Ireland

We show only the number, date and subject of each Waterways Ireland marine notice, with a link to the full notice; any summary is our own. Lock and bridge hours and harbour services come from Waterways Ireland’s public pages and notices, in our own words. We do not use Waterways Ireland’s map data. Jetty Hop is not connected with Waterways Ireland.

Our credit line, quoted in English as we publish it everywhere.

Marine notices: number, date and subject from Waterways Ireland (https://www.waterwaysireland.org/news). Summaries by Jetty Hop, in our own words. Always read the full notice on Waterways Ireland’s site.

Waterways Ireland marine notices

Bathing water: Environmental Protection Agency

CC BY 4.0

We do not show EPA bathing water data. Water quality for the few bathing waters on the navigations is on the EPA’s beaches.ie, which the map’s bathing layer links. If we add EPA data later, it will carry the credit line below. Jetty Hop is not connected with the EPA or An Taisce.

The credit line we will use, quoted in English.

Bathing water data: Environmental Protection Agency (beaches.ie), CC BY 4.0, modified by Jetty Hop.

beaches.ie · CC BY 4.0

Attractions and activities: Fáilte Ireland

CC BY 4.0

We do not show attractions, activities, accommodation or events data from Fáilte Ireland yet: everything listed under a stop is our own. When we add Fáilte Ireland data, it will carry the credit below.

Required wording, quoted in English as published.

Contains Irish Public Sector Data licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence

Attractions, activities, accommodation and events data: Fáilte Ireland, via data.gov.ie, licensed under CC BY 4.0. Filtered to the areas near the waterways we cover, re-categorised and edited by Jetty Hop. Provided “as is” without warranty; Jetty Hop is not affiliated with or endorsed by Fáilte Ireland. Fáilte Ireland photos are not used.

Dataset on data.gov.ie · CC BY 4.0 · data.gov.ie

Public moorings and slipways: Roscommon County Council

CC BY 4.0

Used for the berth counts and public-slipway facts in County Roscommon (Lough Key, the Boyle River and the Shannon around Cootehall and Knockvicar).

Required wording, quoted in English as published.

Contains Irish Public Sector Data licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence: Roscommon County Council, “Public Moorings and Piers – Roscommon” and “Public Slipways – Roscommon”, via data.gov.ie (https://data.gov.ie/dataset/public-moorings-and-piers-roscommon5, https://data.gov.ie/dataset/public-slipways-roscommon5). Selected facts, re-worded by Jetty Hop.

Public Moorings and Piers – Roscommon · Public Slipways – Roscommon · CC BY 4.0

Irish place names: Logainm

CC BY 4.0

Irish-language placename data by Logainm © Government of Ireland and licensed under CC BY 4.0.

logainm.ie · CC BY 4.0

Photos

Every photo is credited where it is shown, and in full below. Photos from Wikimedia Commons and Geograph are used under their own licences; the photographers keep their copyright. A photo we changed (cropped, for example) stays under its licence; resizing and re-encoding are not changes.

Wikimedia Commons · Geograph

451 photos

Fonts, icons and software

Weather icons: drawn by Jetty Hop. Illustrations: generated for Jetty Hop and always labelled “Illustration”.

• MapLibre GL JS – © MapLibre contributors – Licence: BSD-3-Clause
• PMTiles – © Protomaps LLC – Licence: BSD-3-Clause
• Protomaps basemap style – © Protomaps LLC, Kelso Cartography – Licence: BSD-3-Clause
• Noto Sans (map labels) – © The Noto Project Authors – Licence: SIL Open Font License 1.1
• Map icons (tangrams/icons) – © Mapzen, Linux Foundation – Licence: MIT
• Fraunces – © The Fraunces Project Authors – Licence: SIL Open Font License 1.1
• Atkinson Hyperlegible Next – © The Atkinson Hyperlegible Next Project Authors – Licence: SIL Open Font License 1.1
• Phosphor Icons – © Phosphor Icons – Licence: MIT
• Workbox – © Google LLC – Licence: MIT
• SunCalc – © Volodymyr Agafonkin – Licence: BSD-2-Clause
• Astro – © Astro contributors – Licence: MIT

SIL Open Font License 1.1: openfontlicense.org