diff --git a/macrovision.js b/macrovision.js
index 21c54cc3..17b8daf8 100644
--- a/macrovision.js
+++ b/macrovision.js
@@ -502,7 +502,7 @@ function drawVerticalScale(ifDirty = false) {
 
     function drawAltitudeLine(ctx, height, label) {
         const pixelScale = (ctx.canvas.clientHeight - 100) / config.height.toNumber();
-        const y = ctx.canvas.clientHeight - 50 - height.toNumber("meters") * pixelScale;
+        const y = ctx.canvas.clientHeight - 50 - (height.toNumber("meters") - config.y) * pixelScale;
         if (y < ctx.canvas.clientHeight - 100) {
             drawTick(ctx, 50, y, label, true);
         }