diff --git a/bookmarks.d/weather.json b/bookmarks.d/weather.json
index 86f6203d..54f41ceb 100644
--- a/bookmarks.d/weather.json
+++ b/bookmarks.d/weather.json
@@ -1,83 +1,88 @@
 [
+    {
+        "name" : "DDH47",
+        "frequency" : 146300,
+        "modulation" : "rtty450"
+    },
+    {
+        "name" : "DDH9",
+        "frequency" : 11038000,
+        "modulation" : "rtty450"
+    },
+    {
+        "name" : "DDH8",
+        "frequency" : 14466300,
+        "modulation" : "rtty450"
+    },
+    {
+        "name" : "DDK2",
+        "frequency" : 4582000,
+        "modulation" : "rtty450"
+    },
+    {
+        "name" : "DDH7",
+        "frequency" : 7645000,
+        "modulation" : "rtty450"
+    },
+    {
+        "name" : "DDK9",
+        "frequency" : 10099800,
+        "modulation" : "rtty450"
+    },
+    {
+        "name" : "NAVTEX",
+        "frequency" : 489000,
+        "modulation" : "sitorb"
+    },
     {
         "name" : "NAVTEX",
         "frequency" : 517000,
         "modulation" : "sitorb"
     },
-    {
-        "name" : "SITOR-B",
-        "frequency" : 4209000,
-        "modulation" : "sitorb"
-    },
-    {
-        "name" : "SITOR-B",
-        "frequency" : 6313000,
-        "modulation" : "sitorb"
-    },
-    {
-        "name" : "SITOR-B",
-        "frequency" : 8415500,
-        "modulation" : "sitorb"
-    },
-    {
-        "name" : "SITOR-B",
-        "frequency" : 12578000,
-        "modulation" : "sitorb"
-    },
-    {
-        "name" : "SITOR-B",
-        "frequency" : 16805500,
-        "modulation" : "sitorb"
-    },
-    {
-        "name" : "SITOR-B",
-        "frequency" : 19679500,
-        "modulation" : "sitorb"
-    },
-    {
-        "name" : "SITOR-B",
-        "frequency" : 22375000,
-        "modulation" : "sitorb"
-    },
-    {
-        "name" : "SITOR-B",
-        "frequency" : 26099500,
-        "modulation" : "sitorb"
-    },
     {
         "name" : "NAVTEX",
         "frequency" : 4208500,
         "modulation" : "sitorb"
     },
     {
-        "name" : "DDH47",
-        "frequency" : 147300,
-        "modulation" : "rtty450"
+        "name" : "MSI",
+        "frequency" : 4209000,
+        "modulation" : "sitorb"
     },
     {
-        "name" : "DDH9",
-        "frequency" : 11039000,
-        "modulation" : "rtty450"
+        "name" : "MSI",
+        "frequency" : 6313000,
+        "modulation" : "sitorb"
     },
     {
-        "name" : "DDH8",
-        "frequency" : 14467300,
-        "modulation" : "rtty450"
+        "name" : "MSI",
+        "frequency" : 8415500,
+        "modulation" : "sitorb"
     },
     {
-        "name" : "DDK2",
-        "frequency" : 4583000,
-        "modulation" : "rtty450"
+        "name" : "MSI",
+        "frequency" : 12578000,
+        "modulation" : "sitorb"
     },
     {
-        "name" : "DDH7",
-        "frequency" : 7646000,
-        "modulation" : "rtty450"
+        "name" : "MSI",
+        "frequency" : 16805500,
+        "modulation" : "sitorb"
     },
     {
-        "name" : "DDK9",
-        "frequency" : 10100800,
-        "modulation" : "rtty450"
+        "name" : "MSI",
+        "frequency" : 19679500,
+        "modulation" : "sitorb"
+    },
+    {
+        "name" : "MSI",
+        "frequency" : 22375000,
+        "modulation" : "sitorb"
+    },
+    {
+        "name" : "MSI",
+        "frequency" : 26099500,
+        "modulation" : "sitorb"
     },
     {
         "name" : "NOAA-1",
diff --git a/bookmarks.txt b/bookmarks.txt
index 56325a2d..a5eb9f51 100644
--- a/bookmarks.txt
+++ b/bookmarks.txt
@@ -46,6 +46,21 @@ DDK2|||4583|RTTY450
 DDH7|||7646|RTTY450
 DDK9|||10100.8|RTTY450
 
+#
+# Weather NAVTEX / SITOR-B stations
+#
+NAVTEX|||490|SITORB
+NAVTEX|||518|SITORB
+NAVTEX|||4209.5|SITORB
+MSI|||4210|SITORB
+MSI|||6314|SITORB
+MSI|||8416.5|SITORB
+MSI|||12579|SITORB
+MSI|||16806.5|SITORB
+MSI|||19680.5|SITORB
+MSI|||22376|SITORB
+MSI|||26100.5|SITORB
+
 #
 # NOAA weather broadcasts
 #
diff --git a/makebookmarks.pl b/makebookmarks.pl
index 496f3402..55f10a1c 100755
--- a/makebookmarks.pl
+++ b/makebookmarks.pl
@@ -32,7 +32,15 @@ while(<STDIN>)
       if($First) { $First=0; } else { printf(",\n"); }
 
       # Set FAX frequencies 1.9kHz lower than the carrier
-      if(lc($Mod) eq "fax") { $Freq -= 1.9; }
+      if(lc($Mod) eq "fax")     { $Freq -= 1.9; }
+      # Set RTTY frequencies 1kHz lower than the left carrier
+      if(lc($Mod) eq "rtty450") { $Freq -= 1.0; }
+      if(lc($Mod) eq "rtty170") { $Freq -= 1.0; }
+      if(lc($Mod) eq "rtty85")  { $Freq -= 1.0; }
+      # Set NAVTEX/SITOR-B frequencies 1kHz lower than the left carrier
+      if(lc($Mod) eq "sitorb")  { $Freq -= 1.0; }
+      # Set CW frequencies 800Hz lower than the carrier
+      if(lc($Mod) eq "cw")  { $Freq -= 0.8; }
 
       printf("    {\n");
       printf("        \"name\" : \"%s\",\n", $Name);