Skip to content
----------------------------------------------------------------------
1. Overview
----------------------------------------------------------------------
a. Opencpn was built with the following objectives in mind.
i. Intended use as primary navigation interface for vessels
with full-time helm-visible navigational suites.
Other tools may be better for offline route planning, tide
and current prediction, online logging, etc.
ii. Quick startup and shutdown.
iii. Those and only those toolbar buttons really needed for
daily operation.
iv. Portability, thus wxWidgets core components. Currently
tested and in production use on Windows XP-8.1, OS X, and Linux.
v. Conventional ( i.e. popular and modern ) chart format
support. In the real world, this means BSB format raster
charts, and S57ENC format vector charts.
And, of course, opencpn is all GPL'ed (or equivalent)
Open Source code.
Personal Note:
Opencpn is in primary daily use as the navigation package aboard
M/V Dyad, a 48 ft trawler yacht cruising from Newfoundland to the
Bahamas yearly.
Our thanks go to MAXCDN for providing a CDN network delivering
the OpenCPN downloads worldwide.
OpenCPN is distributed using a multitude of licenses, see LICENSING.

About

A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all
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function addCopyButtons() {
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try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - caesar/OpenCPN: A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation · GitHub
Skip to content
----------------------------------------------------------------------
1. Overview
----------------------------------------------------------------------
a. Opencpn was built with the following objectives in mind.
i. Intended use as primary navigation interface for vessels
with full-time helm-visible navigational suites.
Other tools may be better for offline route planning, tide
and current prediction, online logging, etc.
ii. Quick startup and shutdown.
iii. Those and only those toolbar buttons really needed for
daily operation.
iv. Portability, thus wxWidgets core components. Currently
tested and in production use on Windows XP-8.1, OS X, and Linux.
v. Conventional ( i.e. popular and modern ) chart format
support. In the real world, this means BSB format raster
charts, and S57ENC format vector charts.
And, of course, opencpn is all GPL'ed (or equivalent)
Open Source code.
Personal Note:
Opencpn is in primary daily use as the navigation package aboard
M/V Dyad, a 48 ft trawler yacht cruising from Newfoundland to the
Bahamas yearly.
Our thanks go to MAXCDN for providing a CDN network delivering
the OpenCPN downloads worldwide.
OpenCPN is distributed using a multitude of licenses, see LICENSING.

About

A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' GitHub - caesar/OpenCPN: A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation · GitHub
Skip to content
----------------------------------------------------------------------
1. Overview
----------------------------------------------------------------------
a. Opencpn was built with the following objectives in mind.
i. Intended use as primary navigation interface for vessels
with full-time helm-visible navigational suites.
Other tools may be better for offline route planning, tide
and current prediction, online logging, etc.
ii. Quick startup and shutdown.
iii. Those and only those toolbar buttons really needed for
daily operation.
iv. Portability, thus wxWidgets core components. Currently
tested and in production use on Windows XP-8.1, OS X, and Linux.
v. Conventional ( i.e. popular and modern ) chart format
support. In the real world, this means BSB format raster
charts, and S57ENC format vector charts.
And, of course, opencpn is all GPL'ed (or equivalent)
Open Source code.
Personal Note:
Opencpn is in primary daily use as the navigation package aboard
M/V Dyad, a 48 ft trawler yacht cruising from Newfoundland to the
Bahamas yearly.
Our thanks go to MAXCDN for providing a CDN network delivering
the OpenCPN downloads worldwide.
OpenCPN is distributed using a multitude of licenses, see LICENSING.

About

A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' GitHub - caesar/OpenCPN: A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation · GitHub
Skip to content
----------------------------------------------------------------------
1. Overview
----------------------------------------------------------------------
a. Opencpn was built with the following objectives in mind.
i. Intended use as primary navigation interface for vessels
with full-time helm-visible navigational suites.
Other tools may be better for offline route planning, tide
and current prediction, online logging, etc.
ii. Quick startup and shutdown.
iii. Those and only those toolbar buttons really needed for
daily operation.
iv. Portability, thus wxWidgets core components. Currently
tested and in production use on Windows XP-8.1, OS X, and Linux.
v. Conventional ( i.e. popular and modern ) chart format
support. In the real world, this means BSB format raster
charts, and S57ENC format vector charts.
And, of course, opencpn is all GPL'ed (or equivalent)
Open Source code.
Personal Note:
Opencpn is in primary daily use as the navigation package aboard
M/V Dyad, a 48 ft trawler yacht cruising from Newfoundland to the
Bahamas yearly.
Our thanks go to MAXCDN for providing a CDN network delivering
the OpenCPN downloads worldwide.
OpenCPN is distributed using a multitude of licenses, see LICENSING.

About

A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' GitHub - caesar/OpenCPN: A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation · GitHub
Skip to content
----------------------------------------------------------------------
1. Overview
----------------------------------------------------------------------
a. Opencpn was built with the following objectives in mind.
i. Intended use as primary navigation interface for vessels
with full-time helm-visible navigational suites.
Other tools may be better for offline route planning, tide
and current prediction, online logging, etc.
ii. Quick startup and shutdown.
iii. Those and only those toolbar buttons really needed for
daily operation.
iv. Portability, thus wxWidgets core components. Currently
tested and in production use on Windows XP-8.1, OS X, and Linux.
v. Conventional ( i.e. popular and modern ) chart format
support. In the real world, this means BSB format raster
charts, and S57ENC format vector charts.
And, of course, opencpn is all GPL'ed (or equivalent)
Open Source code.
Personal Note:
Opencpn is in primary daily use as the navigation package aboard
M/V Dyad, a 48 ft trawler yacht cruising from Newfoundland to the
Bahamas yearly.
Our thanks go to MAXCDN for providing a CDN network delivering
the OpenCPN downloads worldwide.
OpenCPN is distributed using a multitude of licenses, see LICENSING.

About

A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' GitHub - caesar/OpenCPN: A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation · GitHub
Skip to content
----------------------------------------------------------------------
1. Overview
----------------------------------------------------------------------
a. Opencpn was built with the following objectives in mind.
i. Intended use as primary navigation interface for vessels
with full-time helm-visible navigational suites.
Other tools may be better for offline route planning, tide
and current prediction, online logging, etc.
ii. Quick startup and shutdown.
iii. Those and only those toolbar buttons really needed for
daily operation.
iv. Portability, thus wxWidgets core components. Currently
tested and in production use on Windows XP-8.1, OS X, and Linux.
v. Conventional ( i.e. popular and modern ) chart format
support. In the real world, this means BSB format raster
charts, and S57ENC format vector charts.
And, of course, opencpn is all GPL'ed (or equivalent)
Open Source code.
Personal Note:
Opencpn is in primary daily use as the navigation package aboard
M/V Dyad, a 48 ft trawler yacht cruising from Newfoundland to the
Bahamas yearly.
Our thanks go to MAXCDN for providing a CDN network delivering
the OpenCPN downloads worldwide.
OpenCPN is distributed using a multitude of licenses, see LICENSING.

About

A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' GitHub - caesar/OpenCPN: A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation · GitHub
Skip to content
----------------------------------------------------------------------
1. Overview
----------------------------------------------------------------------
a. Opencpn was built with the following objectives in mind.
i. Intended use as primary navigation interface for vessels
with full-time helm-visible navigational suites.
Other tools may be better for offline route planning, tide
and current prediction, online logging, etc.
ii. Quick startup and shutdown.
iii. Those and only those toolbar buttons really needed for
daily operation.
iv. Portability, thus wxWidgets core components. Currently
tested and in production use on Windows XP-8.1, OS X, and Linux.
v. Conventional ( i.e. popular and modern ) chart format
support. In the real world, this means BSB format raster
charts, and S57ENC format vector charts.
And, of course, opencpn is all GPL'ed (or equivalent)
Open Source code.
Personal Note:
Opencpn is in primary daily use as the navigation package aboard
M/V Dyad, a 48 ft trawler yacht cruising from Newfoundland to the
Bahamas yearly.
Our thanks go to MAXCDN for providing a CDN network delivering
the OpenCPN downloads worldwide.
OpenCPN is distributed using a multitude of licenses, see LICENSING.

About

A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation

Resources

Stars

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Universal Dark Mode - works on any site (function() { var enabled = true; function applyDarkMode() { if (!enabled) return; // Create style element if it doesn't exist var style = document.getElementById('universal-dark-mode-style'); if (!style) { style = document.createElement('style'); style.id = 'universal-dark-mode-style'; document.head.appendChild(style); } // Dark mode CSS - inverts colors but preserves images/video style.textContent = ' /* Invert everything except media */ html { filter: invert(1) hue-rotate(180deg) !important; background: #1a1a2e !important; } /* Restore images, videos, iframes, canvas */ img, video, iframe, canvas, svg, picture, [style*="background-image"] { filter: invert(1) hue-rotate(180deg) !important; } /* Preserve specific elements that should not be inverted */ .no-dark-mode, .no-dark-mode *, [data-theme="light"], [data-theme="light"], .ace_editor, .ace_editor *, .CodeMirror, .CodeMirror *, .monaco-editor, .monaco-editor *, .markdown-body pre, .markdown-body pre *, .highlight, .highlight *, pre code, pre code * { filter: none !important; } /* Fix common UI elements */ .modal, .popup, .dropdown-menu, .tooltip, .popover { filter: invert(1) hue-rotate(180deg) !important; background: #2d2d44 !important; border-color: #444 !important; } /* Scrollbars */ ::-webkit-scrollbar { background: #1a1a2e !important; } ::-webkit-scrollbar-thumb { background: #444 !important; } ::-webkit-scrollbar-thumb:hover { background: #555 !important; } /* Selection */ ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; } ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; } '; } function removeDarkMode() { var style = document.getElementById('universal-dark-mode-style'); if (style) style.remove(); } // Toggle with Alt+Shift+D document.addEventListener('keydown', function(e) { if (e.altKey && e.shiftKey && e.key === 'D') { e.preventDefault(); enabled = !enabled; if (enabled) { applyDarkMode(); console.log('[Universal Dark Mode] Enabled'); } else { removeDarkMode(); console.log('[Universal Dark Mode] Disabled'); } } }); // Apply on load applyDarkMode(); // Re-apply on dynamic content var observer = new MutationObserver(function(mutations) { if (enabled && !document.getElementById('universal-dark-mode-style')) { applyDarkMode(); } }); observer.observe(document.head, { childList: true }); console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle'); })(); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); GitHub - caesar/OpenCPN: A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation · GitHub
Skip to content
----------------------------------------------------------------------
1. Overview
----------------------------------------------------------------------
a. Opencpn was built with the following objectives in mind.
i. Intended use as primary navigation interface for vessels
with full-time helm-visible navigational suites.
Other tools may be better for offline route planning, tide
and current prediction, online logging, etc.
ii. Quick startup and shutdown.
iii. Those and only those toolbar buttons really needed for
daily operation.
iv. Portability, thus wxWidgets core components. Currently
tested and in production use on Windows XP-8.1, OS X, and Linux.
v. Conventional ( i.e. popular and modern ) chart format
support. In the real world, this means BSB format raster
charts, and S57ENC format vector charts.
And, of course, opencpn is all GPL'ed (or equivalent)
Open Source code.
Personal Note:
Opencpn is in primary daily use as the navigation package aboard
M/V Dyad, a 48 ft trawler yacht cruising from Newfoundland to the
Bahamas yearly.
Our thanks go to MAXCDN for providing a CDN network delivering
the OpenCPN downloads worldwide.
OpenCPN is distributed using a multitude of licenses, see LICENSING.

About

A concise ChartPlotter/Navigator. A cross-platform ship-borne GUI application supporting * GPS/GPDS Postition Input * BSB Raster Chart Display * S57 Vector ENChart Display * AIS Input Decoding * Waypoint Autopilot Navigation

Resources

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