diff --git a/lib/microwaveprop/ionosphere/giro_client.ex b/lib/microwaveprop/ionosphere/giro_client.ex
index 138fbe56..44093b5d 100644
--- a/lib/microwaveprop/ionosphere/giro_client.ex
+++ b/lib/microwaveprop/ionosphere/giro_client.ex
@@ -58,8 +58,11 @@ defmodule Microwaveprop.Ionosphere.GiroClient do
         {:ok, %{status: 200, body: body}} when is_binary(body) ->
           parse_tabular(body)
 
-        {:ok, %{status: status, body: body}} ->
-          {:error, "GIRO HTTP #{status}: #{inspect(body)}"}
+        {:ok, %{status: 404}} ->
+          {:error, :giro_api_unavailable}
+
+        {:ok, %{status: status}} ->
+          {:error, "GIRO HTTP #{status}"}
 
         {:error, reason} ->
           {:error, "GIRO request failed: #{inspect(reason)}"}
diff --git a/lib/microwaveprop/workers/ionosphere_fetch_worker.ex b/lib/microwaveprop/workers/ionosphere_fetch_worker.ex
index 0cb319ee..d94958f3 100644
--- a/lib/microwaveprop/workers/ionosphere_fetch_worker.ex
+++ b/lib/microwaveprop/workers/ionosphere_fetch_worker.ex
@@ -74,5 +74,6 @@ defmodule Microwaveprop.Workers.IonosphereFetchWorker do
   end
 
   defp format_reason(reason) when is_binary(reason), do: reason
+  defp format_reason(:giro_api_unavailable), do: "GIRO API endpoint unavailable (404)"
   defp format_reason(reason), do: inspect(reason, printable_limit: 200)
 end