Basic Website for Mad Mutt Software

Android Apps (currently Android only) for marine and leisure applications

Marine Navigator

Navigator full icon

This app was originally written to meet my own needs as I could find nothing like it at the time.  It isn't a chart plotter, it must be used alongside paper charts or a chart plotter.  It replicates the functionality of a marine GPS with no chart plotter, but it has grown to the point where the functionality is large. Very large.

The app is designed to work at sea.  You may think many of the screen layouts are big and blobby; they are.  Experience has shown that “big and blobby” works on a boat at sea; whereas small and fiddly does not.

The original navigator was released for Android 2 in December 2012. The Navigator2 is the current version, last updated on September 2016 .  It is targeted at Android6, but will run on anything more modern then Android4.

Green lateral marker

The app is available in two versions, the free version (adequate for most things) and the full (paid) version.  The listings on Google Play can be found here:
Navigator2 free.
Navigator2 full.

Red lateral marker

Try the free version first and see how you get on with it.  The full version includes things I would find it hard to live without.  Routes, ETA to waypoint, ETA to route, an anchor alarm wich can send an SMS text to another device if your anchor drags and much more.

However to get an idea of the full and considerable capabilities of the app, please download the instructions from the page below.  You will even see a picture of the mad mutt in the instructions.

 Instructions Page 


Guard Mutt

Guardmitt icon

If you have an old spare Android device, you can use it to remotely monitor the position of your boat (or caravan), monitor whether the mains electricity is connected and even cause photos to be taken.

I wrote this app as I leave my boat out of the water in a boatyard which allows me a full-time mains electricity connection.  It is not easy to drain the fresh water system, and the winters are not so very harsh in the South of the UK, so I leave a few low power tube heaters in strategic places to stop the system freezing up.  However, I like to be able to remotely monitor that the mains is still connected; boatyard electrics tend to be unreliable. Armed with an old Android device this is easy (you need a mains charger, not a 12V charger, though.  The app monitors whether the Android device is charging or not).

You can also remotely take a photograph using either the front or rear camera on your phone (assuming it has both).  The app is not to be used for snooping on, say, young children and I have designed it to be hard to use for this purpose.  For example, the feature only works with the Android device permanently connected to a charger, and there must be a preview pane that is visible at all times.  In Google’s own words, it should not be possible to take a picture without knowing that a picture has been taken.

As well as downloading the Android (only) app from Google Play, you must also register with the Guard Mutt Website, which is how you will remotely monitor your boat.

Guard Mutt Website

 Instructions Page 


NMEA Bluetooth Mutt

Bluetooth Mutt Icon

This app is a very specialist and will be of limited use to the general public. It is designed to allow an Android phone with a built in GPS to transmit your position to a GMDSS enabled marine VHF with an NMEA 0183 interface using a Bluetooth adapter module. Limited data can be sent to an autopilot, or other equipment with an NMEA 0183 input. It is necessary to build some electronics. Also, the re-flashing of the Bluetooth module requires some computing knowledge. Instructions on my prototype can be found on the instructions page.  The instrictions include my circuit diagram (please suggest a better circuit) and a photo of my prototype Bluetooth to NMEA 0183 module I built. There are many ways to achieve the same thing.

Or true Bluetooth to NMEA0183  converters can be purchased at some cost (the components for the prototype circuit cost I made about £10). It is possible that at some point in the future I may be able to supply modules pre-assembled and pre-flashed to the data rate of 4800 baud, which is what NMEA 0183 requires.

At present, NMEA 2000 is not supported.

The app is available in two versions, the free version (adequate for most things) and the full (paid) version.  The listings on Google Play can be found here:
NMEA Bluetooth Mutt

 Instructions Page 



 No, I'm not quite sure what this image represents beyond something promotional.

Mutt on paper chart