The page ( should be accessed via the browser on your mobile phone. 

The popup message, (as shown below), will be shown after pressing the 'Install Here' button, and the IOS app should install in the background: 

After the App has been installed and before you can use it please do the following on your Apple device:   

        a) Go to Settings > General > Device Management 
        b) Click on Marlow Navigation  
        c) Click TRUST Marlow Navigation