diff --git a/src/blackmisc/avaircrafticao.cpp b/src/blackmisc/avaircrafticao.cpp
index 5858bbe31..4794fe705 100644
--- a/src/blackmisc/avaircrafticao.cpp
+++ b/src/blackmisc/avaircrafticao.cpp
@@ -128,5 +128,25 @@ namespace BlackMisc
             return (regexp.match(designator).hasMatch());
         }
 
+        /*
+         * Valid combined type
+         */
+        bool CAircraftIcao::isValidCombinedType(const QString &combinedType)
+        {
+            static QRegularExpression regexp("^[A-Z][0-9][A-Z]$");
+            if (combinedType.length() != 3) return false;
+            return (regexp.match(combinedType).hasMatch());
+        }
+
+        /*
+         *  Valid airline designator
+         */
+        bool CAircraftIcao::isValidAirlineDesignator(const QString &airline)
+        {
+            static QRegularExpression regexp("^[A-Z]+[A-Z0-9]*$");
+            if (airline.length() < 2 || airline.length() > 5) return false;
+            return (regexp.match(airline).hasMatch());
+        }
+
     } // namespace
 } // namespace
diff --git a/src/blackmisc/avaircrafticao.h b/src/blackmisc/avaircrafticao.h
index 757ef53d3..0e1fcb137 100644
--- a/src/blackmisc/avaircrafticao.h
+++ b/src/blackmisc/avaircrafticao.h
@@ -138,6 +138,12 @@ namespace BlackMisc
             //! Valid designator?
             static bool isValidDesignator(const QString &designator);
 
+            //! Valid combined type
+            static bool isValidCombinedType(const QString &combinedType);
+
+            //! Valid designator?
+            static bool isValidAirlineDesignator(const QString &airline);
+
         protected:
             //! \copydoc CValueObject::convertToQString
             virtual QString convertToQString(bool i18n = false) const override;
diff --git a/src/blackmisc/avcallsign.cpp b/src/blackmisc/avcallsign.cpp
index 3928e04ee..bf158fd84 100644
--- a/src/blackmisc/avcallsign.cpp
+++ b/src/blackmisc/avcallsign.cpp
@@ -126,5 +126,15 @@ namespace BlackMisc
             }
         }
 
+        /*
+         * Valid callsign?
+         */
+        bool CCallsign::isValidCallsign(const QString &callsign)
+        {
+            static QRegularExpression regexp("^[A-Z]+[A-Z0-9]*$");
+            if (callsign.length() < 2 || callsign.length() > 10) return false;
+            return (regexp.match(callsign).hasMatch());
+        }
+
     } // namespace
 } // namespace
diff --git a/src/blackmisc/avcallsign.h b/src/blackmisc/avcallsign.h
index 2647e57d3..8456d885c 100644
--- a/src/blackmisc/avcallsign.h
+++ b/src/blackmisc/avcallsign.h
@@ -75,6 +75,9 @@ namespace BlackMisc
             //! \copydoc CValueObject::setPropertyByIndex(variant, index)
             virtual void setPropertyByIndex(const QVariant &variant, const BlackMisc::CPropertyIndex &index) override;
 
+            //! Valid callsign?
+            static bool isValidCallsign(const QString &callsign);
+
         protected:
             //! \copydoc CValueObject::convertToQString()
             virtual QString convertToQString(bool i18n = false) const override;
diff --git a/src/blackmisc/nwserver.cpp b/src/blackmisc/nwserver.cpp
index ef5f45a0c..533bdcd67 100644
--- a/src/blackmisc/nwserver.cpp
+++ b/src/blackmisc/nwserver.cpp
@@ -38,6 +38,17 @@ namespace BlackMisc
             return this->m_user.hasValidCredentials() && this->m_port > 0 && !this->m_address.isEmpty() && this->isAcceptingConnections();
         }
 
+        CStatusMessageList CServer::validate() const
+        {
+            CStatusMessageList msgs;
+            if (this->getName().isEmpty()) { msgs.push_back(CStatusMessage(CStatusMessage::SeverityWarning, "Missing name")); }
+            if (this->getAddress().isEmpty()) { msgs.push_back(CStatusMessage(CStatusMessage::SeverityWarning, "Missing address")); }
+            if (this->getDescription().isEmpty()) { msgs.push_back(CStatusMessage(CStatusMessage::SeverityWarning, "Missing description")); }
+            if (this->getPort() < 1 || this->getPort() > 65535) { msgs.push_back(CStatusMessage(CStatusMessage::SeverityWarning, "Wrong port")); }
+            msgs.push_back(this->getUser().validate());
+            return msgs;
+        }
+
         /*
          * Property by index
          */
diff --git a/src/blackmisc/nwserver.h b/src/blackmisc/nwserver.h
index 349dd24e7..69fc7e810 100644
--- a/src/blackmisc/nwserver.h
+++ b/src/blackmisc/nwserver.h
@@ -11,7 +11,9 @@
 
 #ifndef BLACKMISC_SERVER_H
 #define BLACKMISC_SERVER_H
+
 #include "nwuser.h"
+#include "statusmessagelist.h"
 #include "valueobject.h"
 
 namespace BlackMisc
@@ -46,7 +48,7 @@ namespace BlackMisc
             const QString &getAddress() const { return m_address; }
 
             //! Set address (e.g. myserver.foo.com)
-            void setAddress(const QString &address) { m_address = address; }
+            void setAddress(const QString &address) { m_address = address.trimmed(); }
 
             //! Get user
             const CUser &getUser() const { return m_user; }
@@ -58,13 +60,13 @@ namespace BlackMisc
             const QString &getName() const { return m_name; }
 
             //! Set name
-            void setName(const QString &name) { m_name = name; }
+            void setName(const QString &name) { m_name = name.trimmed(); }
 
             //! Get description
             const QString &getDescription() const { return m_description; }
 
             //! Set description
-            void setDescription(const QString &description) { m_description = description; }
+            void setDescription(const QString &description) { m_description = description.trimmed().simplified(); }
 
             //! Get port
             qint32 getPort() const { return m_port; }
@@ -81,6 +83,9 @@ namespace BlackMisc
             //! Is valid for login?
             bool isValidForLogin() const;
 
+            //! Validate, provide details about issues
+            BlackMisc::CStatusMessageList validate() const;
+
             //! \copydoc CValueObject::propertyByIndex(int)
             virtual QVariant propertyByIndex(const BlackMisc::CPropertyIndex &index) const override;
 
diff --git a/src/blackmisc/nwuser.cpp b/src/blackmisc/nwuser.cpp
index 11eb95b1e..f84d91777 100644
--- a/src/blackmisc/nwuser.cpp
+++ b/src/blackmisc/nwuser.cpp
@@ -17,9 +17,6 @@ namespace BlackMisc
 {
     namespace Network
     {
-        /*
-         * Convert to string
-         */
         QString CUser::convertToQString(bool /** i18n **/) const
         {
             if (this->m_realname.isEmpty()) return "<no realname>";
@@ -35,6 +32,16 @@ namespace BlackMisc
             return s;
         }
 
+        CStatusMessageList CUser::validate() const
+        {
+            CStatusMessageList msgs;
+            // callsign optional
+            if (!this->hasValidId()) { msgs.push_back(CStatusMessage(CStatusMessage::SeverityWarning, "Invalid id"));}
+            if (!this->hasValidRealName()) { msgs.push_back(CStatusMessage(CStatusMessage::SeverityWarning, "Invalid real name"));}
+            if (!this->hasValidCredentials()) { msgs.push_back(CStatusMessage(CStatusMessage::SeverityWarning, "Invalid credentials"));}
+            return msgs;
+        }
+
         /*
          * Exchange data
          */
@@ -63,6 +70,15 @@ namespace BlackMisc
                 this->setCallsign(otherUser.getCallsign());
         }
 
+        bool CUser::isValidVatsimId(const QString &id)
+        {
+            if (id.isEmpty()) { return false; }
+            bool ok;
+            int i = id.toInt(&ok);
+            if (!ok) { return false; }
+            return i >= 100000 && i <= 9999999;
+        }
+
         /*
          * Property by index
          */
diff --git a/src/blackmisc/nwuser.h b/src/blackmisc/nwuser.h
index 08f044491..41a0c36c8 100644
--- a/src/blackmisc/nwuser.h
+++ b/src/blackmisc/nwuser.h
@@ -15,6 +15,7 @@
 #include "avcallsign.h"
 #include "avairporticao.h"
 #include "propertyindex.h"
+#include "statusmessagelist.h"
 
 namespace BlackMisc
 {
@@ -60,7 +61,7 @@ namespace BlackMisc
             QString getRealName() const { return m_realname; }
 
             //! setRealName
-            void setRealName(const QString &realname) { m_realname = realname.trimmed(); }
+            void setRealName(const QString &realname) { m_realname = realname.trimmed().simplified(); }
 
             //! Get password
             QString getPassword() const { return m_password; }
@@ -83,6 +84,9 @@ namespace BlackMisc
             //! Has associated callsign?
             bool hasValidCallsign() const { return !m_callsign.isEmpty(); }
 
+            //! Validate, provide details about issues
+            BlackMisc::CStatusMessageList validate() const;
+
             //! Get email.
             QString getEmail() const { return m_email; }
 
@@ -125,6 +129,9 @@ namespace BlackMisc
              */
             void syncronizeData(CUser &otherUser);
 
+            //! Valid VATSIM id
+            static bool isValidVatsimId(const QString &id);
+
         protected:
             //! \copydoc CValueObject::convertToQString
             virtual QString convertToQString(bool i18n = false) const override;