diff --git a/lib/microwaveprop/accounts.ex b/lib/microwaveprop/accounts.ex
index 21c69e56..8c66041f 100644
--- a/lib/microwaveprop/accounts.ex
+++ b/lib/microwaveprop/accounts.ex
@@ -235,6 +235,23 @@ defmodule Microwaveprop.Accounts do
     |> update_user_and_delete_all_tokens()
   end
 
+  @doc """
+  Builds a home-QTH changeset from the given attrs (no DB write).
+  Useful for rendering the form in templates and LiveViews.
+  """
+  @spec change_user_home_qth(User.t(), map()) :: Ecto.Changeset.t()
+  def change_user_home_qth(%User{} = user, attrs \\ %{}) do
+    User.change_home_qth(user, attrs)
+  end
+
+  @doc """
+  Updates the user's home QTH (grid + lat/lon + optional elevation).
+  """
+  @spec update_user_home_qth(User.t(), map()) :: {:ok, User.t()} | {:error, Ecto.Changeset.t()}
+  def update_user_home_qth(%User{} = user, attrs) do
+    user |> User.change_home_qth(attrs) |> Repo.update()
+  end
+
   ## Session
 
   @doc """
diff --git a/lib/microwaveprop_web/controllers/user_settings_controller.ex b/lib/microwaveprop_web/controllers/user_settings_controller.ex
index c721cc58..ca621336 100644
--- a/lib/microwaveprop_web/controllers/user_settings_controller.ex
+++ b/lib/microwaveprop_web/controllers/user_settings_controller.ex
@@ -9,6 +9,7 @@ defmodule MicrowavepropWeb.UserSettingsController do
 
   plug :require_sudo_mode
   plug :assign_email_and_password_changesets
+  plug :assign_home_qth_changeset
   plug :assign_beacon_monitors
 
   def edit(conn, _params) do
@@ -40,6 +41,21 @@ defmodule MicrowavepropWeb.UserSettingsController do
     end
   end
 
+  def update(conn, %{"action" => "update_home_qth"} = params) do
+    %{"user" => user_params} = params
+    user = conn.assigns.current_scope.user
+
+    case Accounts.update_user_home_qth(user, user_params) do
+      {:ok, _user} ->
+        conn
+        |> put_flash(:info, "Home QTH updated.")
+        |> redirect(to: ~p"/users/settings")
+
+      {:error, changeset} ->
+        render(conn, :edit, home_qth_changeset: changeset)
+    end
+  end
+
   def update(conn, %{"action" => "update_password"} = params) do
     %{"user" => user_params} = params
     user = conn.assigns.current_scope.user
@@ -78,6 +94,11 @@ defmodule MicrowavepropWeb.UserSettingsController do
     |> assign(:password_changeset, Accounts.change_user_password(user))
   end
 
+  defp assign_home_qth_changeset(conn, _opts) do
+    user = conn.assigns.current_scope.user
+    assign(conn, :home_qth_changeset, Accounts.change_user_home_qth(user))
+  end
+
   defp assign_beacon_monitors(conn, _opts) do
     user = conn.assigns.current_scope.user
 
diff --git a/lib/microwaveprop_web/controllers/user_settings_html/edit.html.heex b/lib/microwaveprop_web/controllers/user_settings_html/edit.html.heex
index b163e66f..9cc1e595 100644
--- a/lib/microwaveprop_web/controllers/user_settings_html/edit.html.heex
+++ b/lib/microwaveprop_web/controllers/user_settings_html/edit.html.heex
@@ -23,6 +23,35 @@
 
   <div class="divider" />
 
+  <.form :let={f} for={@home_qth_changeset} action={~p"/users/settings"} id="update_home_qth">
+    <input type="hidden" name="action" value="update_home_qth" />
+
+    <div class="text-left mb-2">
+      <h3 class="font-semibold">Home QTH</h3>
+      <p class="text-xs opacity-70">
+        Used to anchor the rover map (drive radius, distance/bearing labels).
+        Enter a Maidenhead grid (e.g. <code>EM13qc</code>) or explicit lat/lon.
+      </p>
+    </div>
+
+    <.input
+      field={f[:home_grid]}
+      type="text"
+      label="Home grid"
+      placeholder="EM13qc"
+      autocomplete="off"
+    />
+
+    <div class="grid grid-cols-2 gap-3">
+      <.input field={f[:home_lat]} type="number" step="any" label="Latitude" />
+      <.input field={f[:home_lon]} type="number" step="any" label="Longitude" />
+    </div>
+
+    <.button variant="primary" phx-disable-with="Saving...">Save Home QTH</.button>
+  </.form>
+
+  <div class="divider" />
+
   <.form :let={f} for={@password_changeset} action={~p"/users/settings"} id="update_password">
     <input type="hidden" name="action" value="update_password" />
 
diff --git a/test/microwaveprop_web/controllers/user_settings_controller_test.exs b/test/microwaveprop_web/controllers/user_settings_controller_test.exs
index 22eb96e9..999ba4a6 100644
--- a/test/microwaveprop_web/controllers/user_settings_controller_test.exs
+++ b/test/microwaveprop_web/controllers/user_settings_controller_test.exs
@@ -70,6 +70,34 @@ defmodule MicrowavepropWeb.UserSettingsControllerTest do
     end
   end
 
+  describe "PUT /users/settings (home QTH form)" do
+    test "updates the user home QTH from a grid", %{conn: conn, user: user} do
+      conn =
+        put(conn, ~p"/users/settings", %{
+          "action" => "update_home_qth",
+          "user" => %{"home_grid" => "EM13qc"}
+        })
+
+      assert redirected_to(conn) == ~p"/users/settings"
+      reloaded = Microwaveprop.Repo.reload(user)
+      assert reloaded.home_grid == "EM13qc"
+      assert is_float(reloaded.home_lat)
+      assert is_float(reloaded.home_lon)
+    end
+
+    test "rejects an invalid grid", %{conn: conn} do
+      conn =
+        put(conn, ~p"/users/settings", %{
+          "action" => "update_home_qth",
+          "user" => %{"home_grid" => "ZZ99zz"}
+        })
+
+      response = html_response(conn, 200)
+      assert response =~ "Home QTH"
+      assert response =~ "must be a 4 or 6 character"
+    end
+  end
+
   describe "PUT /users/settings (change email form)" do
     @tag :capture_log
     test "updates the user email", %{conn: conn, user: user} do