Add OpenSeaMaps

[joshuafuller]

Feature Request: Add OpenSeaMaps

Description

Add support for OpenSeaMaps as a custom map source. This addition will enhance the functionality by including nautical charting data provided by OpenSeaMaps. Credit for the XML configuration goes to Jonathan Svensson.

XML Configuration

<?xml version="1.0" encoding="UTF-8"?>
<customMapSource>
    <name>OpenSeaMapTILES</name>
    <minZoom>0</minZoom>
    <maxZoom>18</maxZoom>
    <tileType>png</tileType>
    <url>https://t2.openseamap.org/tile/{$z}/{$x}/{$y}.png</url>
    <coordinatesystem>epsg:3857</coordinatesystem>
    <backgroundColor>#000000</backgroundColor>
    <ignoreErrors>false</ignoreErrors>
</customMapSource>

Purpose

•	To provide support for nautical maps via OpenSeaMaps.
•	Improves mapping functionality for users needing marine chart data.

Acceptance Criteria

•	OpenSeaMaps tiles are displayed correctly when added as a custom map source.
•	Ensure compatibility with zoom levels from 0 to 18.
•	Handle errors gracefully if tiles fail to load.
•	Validate and ensure the coordinates system matches epsg:3857.

Additional Notes

•	OpenSeaMaps tiles are served as PNG files and require a dark background color (#000000) for optimal visibility.
•	Ensure the implementation doesn’t conflict with existing map sources.

Would appreciate any feedback or additional considerations for this integration. Thank you!

You can now paste this directly into a GitHub issue. Let me know if you need further assistance!