openseamap.org

https://openseamap.org· First analyzed 10 May 2026· Updated 10 May 2026

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openseamap.org

Mobile

Sponsored

Hosting Provider

noris network AG

IP Address

213.95.155.108

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS12337

Organization

noris network AG

Server

Nginx

Nameservers

cns2.cloudpit.com.cns1.cloudpit.de.cns3.cloudpit.io.

Performance

Core Web Vitals

Weight

First Contentful Paint

789 ms10%

Speed Index

1.0 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1 MB

99 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

TYPO3

Technology Stack

3 Technologies Detected

CSS Frameworks

Tailwind CSS

Web Servers

Nginxv1.18.0

Customer Support

Zendesk

SEO Analysis

D55/100

Meta Tags7/15

Content11/12

Headings8/8

Technical8/21

E-E-A-T3/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

openseamap.orgopenseamap.org

OpenSeaMap: Startseite

OpenSeaMap - die freie Seekarte, nach dem Wiki-Prinzip, auf PC, Garmin, Lowrance.

Title Length22 chars

Recommended: 50-60 chars (~137px / 580px)

Description Length81 chars

Recommended: 120-160 chars

Issues (2)

• Most images missing alt text (69/88) — critical for accessibility and SEO
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

10 issues found

Upgrade to view details

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F36/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

0/25

Citation

6/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:6%

Words:507

Token eff.:Optimal

Sections/1K:13.8

Structured Data

No Schema

Citation Readiness

Opening Summary10w

Descriptive Headingsavg 2.3w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

AI readiness recommendation preview...

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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

54/100

Passed

Critical

Warnings

Images & Alt Text

5/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

14/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

3 recommendations

•Accessibility recommendation preview...

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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

50/100

105 mg

CO₂e / view

1.0 MB

Page Weight

70%

Cleaner Than

New Visitor

120 mg

Returning (cached)

60 mg

Annual (10K/mo)

12.6 kg

Emission Segments

Data Center

5 mg

Network

31 mg

Device

69 mg

Resource Breakdown

JavaScript

753.7 KB

Images

239.9 KB

CSS

35.1 KB

HTML

10.4 KB

Green Hosting Verified

noris network AG

GWF Verified

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

53d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

04.04.2026

Valid Until

03.07.2026

Subject Alternative Names (4)

openseamap.orgopenseamap.smurf.noris.dewww.openseamap.orgwww.openseamap.smurf.noris.de

SHA-256 Fingerprint

C2:3B:05:58:66:3E:9D:30:55:AE:62:8B:16:DF:54:C2:81:6A:A1:0F...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Sun, 10 May 2026 05:09:53 GMT

server

nginx/1.18.0

transfer-encoding

chunked

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mx.freenet.de

Domain Information

openseamap.org

Domain Age

17y 1m

Created

26.03.2009

Expires

26.03.2027

Last Updated

26.03.2026

Registrar

Ascio Technologies, Inc. Danmark - Filial af Ascio technologies, Inc. USA

DNSSEC

Not Enabled

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

35/100

Not Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Arial

WCAG AA

77/100

Readability

/30

20/30

16px · LH --

Hierarchy

/20

18/20

2x ratio · ✓ H1→H6

WCAG

/25

19/25

5.58:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Arial

Sans32px

Body Font

Arial

Sans16px

Contrast Ratio

5.58:1

WCAG AA (≥4.5:1)

Reading Comfort

Single Font Family

left aligned

32px

20px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

❌ Very complex text: Flesch score 21/100. Consider shorter sentences and simpler words.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.6:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

✅ System fonts: Zero font loading delay — best possible LCP impact.

Flesch 21

Color Palette

8 unique colors

2.85:1 Fail Light

#ffffff

Text· 20.3%

#929aa1

Other· 9.3%

#abd3df

Primary· 29.4%

#f0efe9

Background· 20.5%

#c2c2f5

Accent· 8.9%

#5a5e6d

Secondary· 6.9%

#cad9d4

Secondary· 2.6%

#d8e5eb

Secondary· 2.3%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

typo3temp(1)js(1)openstreetmap.org(1)

Website Identity

openseamap.org

17 years old

Location detected: 🇩🇪 Germanyvia ip

Ascio Technologies, Inc. Danmark - Filial af Ascio technologies, Inc. USAen

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Last analyzed: 10 May 2026 at 05:10

Historical Analysis & Change Tracking