Mariner GPS Tools

Marine navigation calculators for GPS distance, bearing, cross track error, coordinates and speed.

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What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    Marine navigation calculators for GPS distance, bearing, cross track error, coordinates and speed.

    How to connect

    How to connect Mariner GPS Tools to Claude

    The server address to paste into Claude settings:

    https://marinergps.tools/mcp

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    How to connect Mariner GPS Tools to ChatGPT

    The server address to paste into ChatGPT settings:

    https://marinergps.tools/mcp

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    How to connect Mariner GPS Tools to Cursor

    The server address to paste into Cursor settings:

    https://marinergps.tools/mcp

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    Server tool list (6)

    Raw names from tools/list. Only developers need these.

    convert_speedConvert a speed value between knots, mph, km/h, m/s, and ft/s.
    convert_coordinatesParse latitude and longitude and format them as decimal degrees or DMS.
    calculate_distanceCalculate great-circle and rhumb-line routes between two GPS coordinates.
    calculate_bearingCalculate the initial true bearing between two GPS coordinates.
    calculate_cross_track_errorCalculate cross track error (XTE) — the perpendicular distance from a vessel position to the great-circle track between two waypoints — plus side of track (port/starboard) and along-track distances.
    list_toolsList the public Mariner GPS Tools calculators currently available.