diff --git a/libs/serializer/src/main/java/de/cyface/serializer/GeoLocation.java b/libs/serializer/src/main/java/de/cyface/serializer/GeoLocation.java
index 706ce21..2ea61bd 100644
--- a/libs/serializer/src/main/java/de/cyface/serializer/GeoLocation.java
+++ b/libs/serializer/src/main/java/de/cyface/serializer/GeoLocation.java
@@ -76,8 +76,9 @@ public GeoLocation(final double lat, final double lon, final long timestamp, fin
         }
         if (speed < 0.) {
             // Occurred on Huawei 10 Mate Pro (RAD-51) and Huawei P30 Android 10 (2021/07)
-            // And still in the 2025 SR campaign `-1.000000`
-            LOGGER.warn(String.format(Locale.US, "Illegal value for speed. Is required to be positive but was %f.", speed));
+            // And still at least for one upload per minute and multiple locations in the 2025 SR campaign `-1.000000`
+            // Thus, we make this INFO as WARN did spam our log [STAD-712].
+            LOGGER.info(String.format(Locale.US, "Illegal value for speed. Is required to be positive but was %f.", speed));
         }
         if (accuracy < 0.) {
             throw new IllegalArgumentException(String.format(Locale.US,