diff --git a/index.html b/index.html
index 204f61e6..b68f1b75 100644
--- a/index.html
+++ b/index.html
@@ -234,7 +234,7 @@
   <div id="loading">
     <div id="titleName"><t data-t="titleName">Azgaar's</t></div>
     <div id="title"><t data-t="title">Fantasy Map Generator</t></div>
-    <div id="version"><t data-t="version">v. </t>1.6</div>
+    <div id="version"><t data-t="version">v. </t>1.61</div>
     <p id="loading-text"><t data-t="loading">LOADING</t><span>.</span><span>.</span><span>.</span></p>
   </div>
 
diff --git a/main.js b/main.js
index 8f738683..448babbe 100644
--- a/main.js
+++ b/main.js
@@ -2,7 +2,7 @@
 // https://github.com/Azgaar/Fantasy-Map-Generator
 
 "use strict";
-const version = "1.6"; // generator version
+const version = "1.61"; // generator version
 document.title += " v" + version;
 
 // Switches to disable/enable logging features
diff --git a/modules/save-and-load.js b/modules/save-and-load.js
index 2d1c8b48..9d4a5e8c 100644
--- a/modules/save-and-load.js
+++ b/modules/save-and-load.js
@@ -323,6 +323,7 @@ function getMapData() {
     const coords = JSON.stringify(mapCoordinates);
     const biomes = [biomesData.color, biomesData.habitability, biomesData.name].join("|");
     const notesData = JSON.stringify(notes);
+    const rulersString = rulers.toString();
 
     // clone svg
     const cloneEl = document.getElementById("map").cloneNode(true);
@@ -332,6 +333,9 @@ function getMapData() {
     cloneEl.setAttribute("height", graphHeight);
     cloneEl.querySelector("#viewbox").removeAttribute("transform");
 
+    // always remove rulers
+    cloneEl.querySelector("#ruler").innerHTML = "";
+
     const svg_xml = (new XMLSerializer()).serializeToString(cloneEl);
 
     const gridGeneral = JSON.stringify({spacing:grid.spacing, cellsX:grid.cellsX, cellsY:grid.cellsY, boundary:grid.boundary, points:grid.points, features:grid.features});
@@ -360,7 +364,7 @@ function getMapData() {
       pack.cells.biome, pack.cells.burg, pack.cells.conf, pack.cells.culture, pack.cells.fl,
       pop, pack.cells.r, pack.cells.road, pack.cells.s, pack.cells.state,
       pack.cells.religion, pack.cells.province, pack.cells.crossroad, religions, provinces,
-      namesData, rivers].join("\r\n");
+      namesData, rivers, rulersString].join("\r\n");
     const blob = new Blob([data], {type: "text/plain"});
 
     TIME && console.timeEnd("createMapDataBlob");
@@ -659,6 +663,7 @@ function parseLoadedData(data) {
     void function parseConfiguration() {
       if (data[2]) mapCoordinates = JSON.parse(data[2]);
       if (data[4]) notes = JSON.parse(data[4]);
+      if (data[33]) rulers.fromString(data[33]);
 
       const biomes = data[3].split("|");
       biomesData = applyDefaultBiomesSystem();
@@ -822,14 +827,6 @@ function parseLoadedData(data) {
     }()
 
     void function restoreEvents() {
-      ruler.selectAll("g").call(d3.drag().on("start", dragRuler));
-      ruler.selectAll("text").on("click", removeParent);
-      ruler.selectAll("g.ruler circle").call(d3.drag().on("drag", dragRulerEdge));
-      ruler.selectAll("g.ruler circle").call(d3.drag().on("drag", dragRulerEdge));
-      ruler.selectAll("g.ruler rect").call(d3.drag().on("start", rulerCenterDrag));
-      ruler.selectAll("g.opisometer circle").call(d3.drag().on("start", dragOpisometerEnd));
-      ruler.selectAll("g.opisometer circle").call(d3.drag().on("start", dragOpisometerEnd));
-
       scaleBar.on("mousemove", () => tip("Click to open Units Editor")).on("click", () => editUnits());
       legend.on("mousemove", () => tip("Drag to change the position. Click to hide the legend")).on("click", () => clearLegend());
     }()
@@ -1136,6 +1133,45 @@ function parseLoadedData(data) {
         // v 1.61 changed rulers data
         ruler.style("display", null);
         rulers = new Rulers();
+
+        ruler.selectAll(".ruler > .white").each(function() {
+          const x1 = +this.getAttribute("x1");
+          const y1 = +this.getAttribute("y1");
+          const x2 = +this.getAttribute("x2");
+          const y2 = +this.getAttribute("y2");
+          if (isNaN(x1) || isNaN(y1) || isNaN(x2) || isNaN(y2)) return;
+          const points = [[x1, y1], [x2, y2]];
+          rulers.create(Ruler, points);
+        });
+
+        ruler.selectAll("g.opisometer").each(function() {
+          const pointsString = this.dataset.points;
+          if (!pointsString) return;
+          const points = JSON.parse(pointsString);
+          rulers.create(Opisometer, points);
+        });
+
+        ruler.selectAll("path.planimeter").each(function() {
+          const length = this.getTotalLength();
+          if (length < 30) return;
+
+          const step = length > 1000 ? 40 : length > 400 ? 20 : 10;
+          const increment = length / Math.ceil(length / step);
+          const points = [];
+          for (let i=0; i <= length; i += increment) {
+            const point = this.getPointAtLength(i);
+            points.push([point.x | 0, point.y | 0]);
+          }
+
+          rulers.create(Planimeter, points);
+        });
+
+        ruler.selectAll("*").remove();
+
+        if (rulers.data.length) {
+          turnButtonOn("toggleRulers");
+          rulers.draw();
+        } else turnButtonOff("toggleRulers");
       }
     }()
 
@@ -1222,6 +1258,9 @@ function parseLoadedData(data) {
     // remove href from emblems, to trigger rendering on load
     emblems.selectAll("use").attr("href", null);
 
+    // draw data layers (no kept in svg)
+    if (rulers && layerIsOn("toggleRulers")) rulers.draw();
+
     // set options
     yearInput.value = options.year;
     eraInput.value = options.era;
diff --git a/modules/ui/layers.js b/modules/ui/layers.js
index ac432df9..41dd273c 100644
--- a/modules/ui/layers.js
+++ b/modules/ui/layers.js
@@ -151,7 +151,7 @@ function drawHeightmap() {
   }
 
   let currentLayer = 20;
-  const heights = cells.i.sort((a, b) => cells.h[a] - cells.h[b]); 
+  const heights = cells.i.sort((a, b) => cells.h[a] - cells.h[b]);
   for (const i of heights) {
     const h = cells.h[i];
     if (h > currentLayer) currentLayer += skip;
@@ -200,7 +200,7 @@ function drawHeightmap() {
     const n = simplification + 1; // filter each nth element
     return chain.filter((d, i) => i % n === 0);
   }
-  
+
   TIME && console.timeEnd("drawHeightmap");
 }
 
@@ -240,7 +240,7 @@ function drawTemp() {
   const used = new Uint8Array(n); // to detect already passed cells
   const min = d3.min(cells.temp), max = d3.max(cells.temp);
   const step = Math.max(Math.round(Math.abs(min - max) / 5), 1);
-  const isolines = d3.range(min+step, max, step); 
+  const isolines = d3.range(min+step, max, step);
   const chains = [], labels = []; // store label coordinates
 
   for (const i of cells.i) {
@@ -557,7 +557,7 @@ function toggleCultures(event) {
 
 function drawCultures() {
   TIME && console.time("drawCultures");
-  
+
   cults.selectAll("path").remove();
   const cells = pack.cells, vertices = pack.vertices, cultures = pack.cultures, n = cells.i.length;
   const used = new Uint8Array(cells.i.length);
@@ -738,7 +738,7 @@ function drawStates() {
     const chain = []; // vertices chain to form a path
     let land = vertices.c[start].some(c => cells.h[c] >= 20 && cells.state[c] !== t);
     function check(i) {state = cells.state[i]; land = cells.h[i] >= 20;}
-    
+
     for (let i=0, current = start; i === 0 || current !== start && i < 20000; i++) {
       const prev = chain[chain.length - 1] ? chain[chain.length - 1][0] : -1; // previous vertex in chain
       chain.push([current, state, land]); // add current vertex to sequence
@@ -797,7 +797,7 @@ function drawBorders() {
       sUsed[s][stateToCell] = stateTo;
       const vertex = cells.v[i].find(v => vertices.c[v].some(i => cells.h[i] >= 20 && cells.state[i] === stateTo));
       const chain = connectVertices(vertex, s, cells.state, stateTo, sUsed);
-      
+
       if (chain.length > 1) {
         sPath.push("M" + chain.map(c => vertices.p[c]).join(" "));
         i--;
@@ -819,7 +819,7 @@ function drawBorders() {
     for (let i=0; i < 1000; i++) {
       if (i === 999) ERROR && console.error("Find starting vertex: limit is reached", current, f, t);
       const p = chain[chain.length-2] || -1; // previous vertex
-      const v = vertices.v[current], c = vertices.c[current]; 
+      const v = vertices.v[current], c = vertices.c[current];
 
       const v0 = checkCell(c[0]) !== checkCell(c[1]) && checkVertex(v[0]);
       const v1 = checkCell(c[1]) !== checkCell(c[2]) && checkVertex(v[1]);
@@ -867,7 +867,7 @@ function toggleBorders(event) {
     if (event && isCtrlClick(event)) {editStyle("borders"); return;}
     turnButtonOff("toggleBorders");
     $('#borders').fadeOut();
-  }  
+  }
 }
 
 function toggleProvinces(event) {
@@ -1196,7 +1196,7 @@ function toggleIcons(event) {
     if (event && isCtrlClick(event)) {editStyle("burgIcons"); return;}
     turnButtonOff("toggleIcons");
     $('#icons').fadeOut();
-  }  
+  }
 }
 
 function toggleRulers(event) {
@@ -1204,10 +1204,12 @@ function toggleRulers(event) {
     turnButtonOn("toggleRulers");
     if (event && isCtrlClick(event)) editStyle("ruler");
     rulers.draw();
+    ruler.style("display", null);
   } else {
     if (event && isCtrlClick(event)) {editStyle("ruler"); return;}
     turnButtonOff("toggleRulers");
-    rulers.undraw();
+    ruler.selectAll("*").remove();
+    ruler.style("display", "none");
   }
 }
 
diff --git a/modules/ui/measurers.js b/modules/ui/measurers.js
index 174c64ec..93ae102a 100644
--- a/modules/ui/measurers.js
+++ b/modules/ui/measurers.js
@@ -240,10 +240,6 @@ class Ruler extends Measurer {
     if (this.points.length < 2) context.el.remove();
     else context.draw();
   }
-
-  undraw() {
-    this.el.remove();
-  }
 }
 
 class Opisometer extends Measurer {