gpsnauticalcharts.com

https://gpsnauticalcharts.com· First analyzed 19 May 2026· Updated 19 May 2026

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Mobile

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Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

98.80.21.196

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Ashburn, United States

ASN

AS14618

Organization

AWS EC2 (us-east-1)

Server

Nginx

CDN

Proxy Cache

Nameservers

maceio.ns.porkbun.com.salvador.ns.porkbun.com.curitiba.ns.porkbun.com.fortaleza.ns.porkbun.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

540 ms10%

Speed Index

702 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

144 KB

20 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

CMS

Drupal

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

Proxy Cache

Progressive Web App

Web Manifest

Technology Stack

7 Technologies Detected

CSS Frameworks

Analytics

Frameworks

Libraries

Web Servers

SEO Analysis

B74/100

Meta Tags13/15

Content11/12

Headings8/8

Technical18/25

E-E-A-T2/7

Images2/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile4/4

Indexability3/3

gpsnauticalcharts.comgpsnauticalcharts.com

i-Boating: Marine Navigation | Nautical Charts App

Download i-Boating for HD nautical charts, lake depth maps, and marine navigation. Features AIS tracking, relief shading, and fishing spots. Get the professi...

Description truncated.

Title Length50 chars

Recommended: 50-60 chars (~293px / 580px)

Description Length215 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (8/11) — critical for accessibility and SEO

6 issues found

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Crawlability

Sitemap

robots.txt

37 rules

Local SEO

Local Search Readiness

10/100

Poor

3 13 1

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

Sponsored

AI & LLM Readiness

D49/100

Bot Access

18/25

Machine Read.

11/25

Schema Data

6/25

Citation

14/25

AI Bot Access

12/14 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

navheader/footer

Text ratio:9%

Words:528

Token eff.:Optimal

Sections/1K:13.3

Depth:2/5

Structured Data

1 JSON-LD

Organization×1.1WebSite

sameAs entity links

Citation Readiness

Opening Summary13w

Descriptive Headingsavg 4.3w

Canonical URL

Open Graph2/3

Twitter Card1/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (10)

AI readiness recommendation preview...

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Sponsored

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.

74/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

17/20

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

Forms & Inputs

15/15

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

13/15

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

ARIA & Roles

9/15

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

1 recommendation

•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.

83/100

A+

15 mg

CO₂e / view

143.6 KB

Page Weight

95%

Cleaner Than

New Visitor

17 mg

Returning (cached)

8 mg

Annual (10K/mo)

1.7 kg

Emission Segments

Data Center

<0.001 g

Network

4 mg

Device

10 mg

Resource Breakdown

JavaScript

39.1 KB

Images

58.5 KB

CSS

37.0 KB

HTML

9.0 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

1 recommendation

•Carbon footprint recommendation preview...

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Security Score

86%Very Good

Static / Informational

HTTPS

No WAF

289d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

03.02.2026

Valid Until

04.03.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

gpsnauticalcharts.comwww.gpsnauticalcharts.com

SHA-256 Fingerprint

E4:7C:F4:00:FF:2C:70:0C:69:20:CF:CA:E1:98:7E:CB:DA:46:0D:22...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin

access-control-expose-headers

X-TILE-REDIRECT

cache-control

🔵 3 Days(max-age=302412, public)

content-encoding

📦 Gzip(gzip)

content-language

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

MX Records (7)

alt2.aspmx.l.google.com

aspmx2.googlemail.com

aspmx3.googlemail.com

aspmx4.googlemail.com

+3 more

Domain Information

gpsnauticalcharts.com

Domain Age

14y 4m

Created

09.01.2012

Expires

09.01.2027

Last Updated

07.01.2026

Registrar

Porkbun LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

66/100

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.

Viewport

width=device-width, initial-scale=1, shrink-to-fit=no

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

-apple-system + Helvetica Neue

WCAG Partial

75/100

Readability

/30

19/30

14px · LH 1.50

Hierarchy

/20

17/20

2.92x ratio · ✓ H1→H6

WCAG

/25

17/25

1:1 min contrast

Performance

/25

22/25

System fonts

Heading Font

-apple-system

Sans40px

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

1:1

11 issues

Reading Comfort

~39 CPL

Narrow lines

40px

32px

20px

14px

❌ Critical: 14px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 11 elements below WCAG AA threshold (min 1.0:1).

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

✅ Strong hierarchy: Headlines are 2.9x larger than body text.

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

Color Palette

8 unique colors

Dark

#6c665b

Secondary· 5.3%

#f8f9fb

Primary· 71.80000000000001%

#8cb2b0

Secondary· 5.4%

#eaae38

Accent· 4.5%

#fdfd5c

Accent· 3.6%

#71fc73

Accent· 3.3%

#f0e5d3

Secondary· 3.1%

#ace0b2

Secondary· 3%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(5)googletagmanager.com(1)code.jquery.com(1)cdn.jsdelivr.net(1)

Website Identity

i-Boating: Marine Navigation

Download i-Boating for HD nautical charts, lake depth maps, and marine navigation. Features AIS tracking, relief shading, and fishing spots. Get the professional GPS chart plotter for Android, iOS, Windows, and Mac.

gpsnauticalcharts.com/main

14 years old

Location detected: 🇺🇸 United Statesvia ip

Porkbun LLC📧 Google Workspaceen

Social Profiles

Facebook X (Twitter)YouTube

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Last analyzed: 19 May 2026 at 05:33

Historical Analysis & Change Tracking