openseamap.org website report
OpenSeaMap: Startseite
Last scanned · 1 view
Overall score
Fair
About openseamap.org
openseamap.org is a website. It describes itself as “OpenSeaMap - die freie Seekarte, nach dem Wiki-Prinzip, auf PC, Garmin, Lowrance”. It is also on YouTube.
Score profile
Top issues to fix
12 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
+6 more issues — details in the sections below.
How it compares
openseamap.org scores higher overall than 27% of the 163,243 sites we have scanned.
vs. All scanned sites
163,243 sitesThe dot is this site; the tick is the typical (median) score for the group. The number on the right is the percentile: the share of the group this site scores above.
Technology stack
openseamap.org is built with Nginx.
Servers (1)
Hosting & DNS
- IP address
- —
- ASN
- —
- IPv6
- Not supported
- HTTP
- HTTP/1.1
Show DNS record values
TXT record contents are not republished; only their count is shown.
Security
openseamap.org uses TLS 1.3 with a certificate valid for 85 more days and sets 0 of 6 recommended security headers.
Security headers0 of 6 set
- HSTSForces HTTPS
- CSPBlocks injected scripts
- X-Frame-OptionsStops clickjacking
- X-Content-TypeStops MIME sniffing
- Referrer-PolicyLimits URL leakage
- Permissions-PolicyRestricts browser features
TLS certificate
- Names covered
- 7
- Cookies set
- 0
Email security
openseamap.org scores F for email security, with no SPF record and no DMARC policy.
- SPFNot set
No SPF record: anyone can claim to send mail from this domain.
- DMARCNot set
No DMARC policy: forged mail is not told to be rejected.
- MTA-STSNot set
Not published; mail to this domain can be downgraded to plaintext.
- BIMINot set
Not published (optional).
Performance & carbon
openseamap.org scores 90/100 for performance, with an estimated load time of 1.4 s. A visit emits an estimated 0.02 g of CO2 (grade A+).
Page weight
- HTML 48.1 KB
- JavaScript 3.7 KB
- CSS 45 B
- Est. load
- 1.36 s
- Response
- 1.36 s
- Scripts / CSS
- 5 / 4
Carbon per visitA+
0.02 g CO2 per uncached view
Estimate from the Sustainable Web Design model. HTML, JavaScript and CSS only; images, video and fonts are not measured. Treat it as a lower bound for comparing pages, not an audit.
SEO & accessibility
openseamap.org scores 70/100 for SEO and 80/100 for accessibility, with 5 SEO issues to fix.
Heading structure
One H1: good.
Image alt text
70 images · 28 without alt text · 0 lazy-loaded
Links
- Internal 43
- External 21
- Broken 3
SEO issues5
- Missing canonical link
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues2
- More than 20% of images are missing alt text
- Missing viewport meta tag
Technical details
Page metadata, social tags, crawl files and scan information.
Meta tags
- Title
- OpenSeaMap: Startseite
- Description
- OpenSeaMap - die freie Seekarte, nach dem Wiki-Prinzip, auf PC, Garmin, Lowrance.
- Canonical
- Language
- en
- Robots meta
Crawl files
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
Structured data
No JSON-LD types declared.
- Microdata items
- 0
- RDFa items
- 0
Scan
- Final URL
- https://openseamap.org/index.php?id=openseamap&no_cache=1
- HTTP status
- 200
- Redirects
- https://openseamap.org → https://openseamap.org/index.php?id=openseamap&no_cache=1
- Scanned
- Aug 24, 2026, 1:22 PM
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Frequently asked questions about openseamap.org
- What is openseamap.org?
- openseamap.org is a website. It describes itself as “OpenSeaMap - die freie Seekarte, nach dem Wiki-Prinzip, auf PC, Garmin, Lowrance”. It is also on YouTube.
- What technology does openseamap.org use?
- openseamap.org is built with Nginx.
- Is openseamap.org secure?
- openseamap.org uses TLS 1.3 with a certificate valid for 85 more days and sets 0 of 6 recommended security headers.
- Is openseamap.org protected against email spoofing?
- openseamap.org scores F for email security, with no SPF record and no DMARC policy.
- How does openseamap.org compare with similar sites?
- openseamap.org scores higher overall than 27% of the 163,243 sites we have scanned.
- What is openseamap.org's overall score?
- openseamap.org has an overall SiteGraph score of 76/100, combining SEO (70), performance (90), security (65) and accessibility (80).
Open Graph & Twitter