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About Navigate Boats

A Navigate Boats guide · Updated 4 November 2026

Navigate Boats is a free, non-commercial personal project. It is a go or no-go board and a trip picker for small boats on the coasts of Croatia, Slovenia and Montenegro. There is a website, navigate.boats, and an iPhone app. You can use the weather and the planning without an account. An account is only for saving trips so they appear on your other devices. This page is a plain description of that. The legal detail is the privacy policy and the terms. Questions go to the support page.

Who is responsible

The privacy policy names Blaz Umek, in Slovenia, as the person responsible, and the contact address contact@navigate.boats. The project is not a harbour office and not a weather service. It does not sell park tickets, berths or passages. The park guide points at the parks’ own sites for that.

What the board is

You set a base, a boat type and size, and whether children are aboard. The live board reads the forecast for that place and turns it into a verdict for that boat: go, caution, or stay in. Smaller boats and boats with children are judged more tightly. Gusts are shown beside the average, because on this coast the gust is often the real wind. Wave height is part of the verdict, because a modest wind can still build a sea. The forecast guide explains those numbers. The go/no-go guide is the habit around them. Neither page is a regulation.

The board names a north-easterly as Bura, a south-easterly as Jugo and a summer afternoon north-westerly as Maestral, when the conditions match. Those guides are the Bura, the Jugo and the Maestral.

Where the data comes from

The weather and sea forecast, and the place search, come from Open-Meteo. Your browser, or the iPhone app, calls Open-Meteo directly. The privacy policy describes what is sent: the coordinates of the places on the page, fixed points on the sea in their Croatian sea regions, and points along a route you draw. It is not an account, and the start of a trip taken from the phone’s position is not sent as one of those points.

In Croatia, DHMZ supplies the marine observations the website shows, and the public wind-warning files that put a floor under the verdict on the website and in the iPhone app. On the website those files are fetched by our host, not by your browser. The iPhone app fetches the warning files from meteo.hr. The files are the same for everyone. DHMZ is the Croatian meteorological and hydrological service, meteo.hr. Slovenia’s own office is ARSO. The app does not claim to ingest an ARSO warning feed. Read ARSO yourself when you are on that coast. Montenegro’s hydrometeorological service is the office for that coast. Read it yourself too.

The map on the website uses tiles from Esri, OpenStreetMap, OpenTopoMap and OpenSeaMap. The iPhone app’s chart on its plan view is Apple Maps, loaded on the phone. The privacy policy lists each of these and what they see, which is an IP address and a map area, not an account.

What it is not

It is not a navigation tool. It does not replace an official forecast, a warning, a chart or a look out of the window. Signing in is optional and uses an account stored for you so trips can sync. The privacy policy says what that account holds and who processes it. There is no analytics product and no advertising on the site. The iPhone app is on the App Store. An Android app is not out. The guides are background reading. The day itself is the board.

Check today’s go/no-go for your boat

These guides describe typical patterns, not today’s weather. Navigate Boats is a planning aid, not a navigation tool: before you go, check the official marine forecast and warnings from DHMZ (Croatia), ARSO (Slovenia) or the Montenegrin hydrometeorological service, and use your own judgement.

More guides

All guides · Live board · Privacy · Terms · Support