diff --git a/preferences.xml b/preferences.xml
index 9cfbfbbe0..2784c2804 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -184,7 +184,7 @@ Started September 2000 by David Megginson, david@megginson.com
  <environment>
   <visibility-m type="double">16000</visibility-m>
   <temperature-sea-level-degc type="double">15</temperature-sea-level-degc>
-  <pressure-sea-level-inhg type="double">28.5</pressure-sea-level-inhg>
+  <pressure-sea-level-inhg type="double">29.92</pressure-sea-level-inhg>
   <density-sea-level-slugft3 type="double">0.00237</density-sea-level-slugft3>
   <wind-from-heading-deg type="double">270</wind-from-heading-deg>
   <clouds>