From 254e9b4c6169b4041be8032b32c2a3d044df1611 Mon Sep 17 00:00:00 2001
From: Roman Priesol <roman@priesol.net>
Date: Thu, 10 Sep 2026 22:14:40 +0200
Subject: [PATCH] Add a scale bar to the map
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

MapLibre's own ScaleControl, bottom-left (attribution already owns
bottom-right) — no custom NPS-style bar needed, the built-in one covers it.
---
 public/js/map.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/public/js/map.js b/public/js/map.js
index 13bd015..43cdf74 100644
--- a/public/js/map.js
+++ b/public/js/map.js
@@ -2,6 +2,7 @@ import {
   Map as MaplibreMap,
   NavigationControl,
   Popup,
+  ScaleControl,
   addProtocol,
 } from "/vendor/maplibre-gl/maplibre-gl.mjs";
 import { GpxPanelControl } from "/js/gpx.js";
@@ -427,6 +428,7 @@ const gnssControl = new GnssControl(map);
 // the "GNSS" sidebar icon actually turns it on — not just whenever a
 // receiver happens to have a fix. See locate.js.
 map.addControl(new LocateControl(gnssControl), "top-left");
+map.addControl(new ScaleControl({ unit: "metric" }), "bottom-left");
 
 // A small inset map showing where the current view sits in context — NPS's
 // own overview plugin (docs/nps-resources.adoc's "overview" entry, still on