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Mariner GPS Tools

by watchandnavy.com · remote · no sign-in to list tools · v1.0.1 · published by com.watchandnavy

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

Final · 3Changes · 2
CompareRegistry entry

6 tools: 3 do something that can't be undone, 2 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http mariner-gps-tools https://marinergps.tools/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

6 tools

Can't be undone 3Claude Code: ask
  • calculate_bearingCalculate the initial true bearing between two GPS coordinates.No findings

    Why it is in this group

    • The input addresses people (input.to): what it sends cannot be taken back.
    Description, as the server wrote it
    Calculate the initial true bearing between two GPS coordinates.
  • calculate_distanceCalculate great-circle and rhumb-line routes between two GPS coordinates.No findings

    Why it is in this group

    • The input addresses people (input.to): what it sends cannot be taken back.
    Description, as the server wrote it
    Calculate great-circle and rhumb-line routes between two GPS coordinates.
  • convert_speedConvert a speed value between knots, mph, km/h, m/s, and ft/s.No findings

    Why it is in this group

    • The name "convert_speed" says "convert": a word for a change.
    • The input addresses people (input.to): what it sends cannot be taken back.
    Description, as the server wrote it
    Convert a speed value between knots, mph, km/h, m/s, and ft/s.
Changes things 2Claude Code: ask
  • 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 alon…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Calculate 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.
  • convert_coordinatesParse latitude and longitude and format them as decimal degrees or DMS.No findings

    Why it is in this group

    • The name "convert_coordinates" says "convert": a word for a change.
    Description, as the server wrote it
    Parse latitude and longitude and format them as decimal degrees or DMS.
Only reads 1Claude Code: allow
  • list_toolsList the public Mariner GPS Tools calculators currently available.No findings

    Why it is in this group

    • The name "list_tools" says "list": a word for reading.
    Description, as the server wrote it
    List the public Mariner GPS Tools calculators currently available.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http mariner-gps-tools https://marinergps.tools/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__mariner-gps-tools__list_tools"
    ],
    "ask": [
      "mcp__mariner-gps-tools__convert_speed",
      "mcp__mariner-gps-tools__convert_coordinates",
      "mcp__mariner-gps-tools__calculate_distance",
      "mcp__mariner-gps-tools__calculate_bearing",
      "mcp__mariner-gps-tools__calculate_cross_track_error"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as mariner-gps-tools. Review it before you use it.