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Polar diagrams in MaxSea TZ

Following the post called “Boat characteristics and learning to wally!” I had a number of mails about polar diagrams see also the comments to that post from Peter Gustafsson.

I can confirm that MaxSea TZ does have a comprehensive polar diagram creation option. It does not assume that the port and starboard speeds are symetrical (like some software). And you can create the diagram automatically

You can then edit the results to take into account special considerations on the day that you made your recording – such as sea state.

You can

…….Click Polar diagrams in MaxSea TZ …. to continue reading


Routing 7 of 7 : - Conclusion & Oscar Ceremony :-)

I do hope that you have found this series of articles delving into optimal routing software interesting. My personal objective was to learn a lot about routing – and I certainly think I did that. I also thought I would find what was the “best” system on the market – no chance – I am afraid life is not that simple!.

One thing I have found is a new and deep respect for the software developers behind these system – as well as their obvious skill and passion for sailing. While I realise that there may well be

…….Click Routing 7 of 7 : – Conclusion & Oscar Ceremony πŸ™‚ …. to continue reading


Routing 6 of 7 : A Chart by any other name...

Most sailors are well aware of the difference between Raster and Vector charts. I have access to both on board plus of course real paper – albeit gradually getting out of date πŸ™ I think we are all past having long debates about which format is better. You will probably have huge amounts of storage on your laptop or various USB drives – so long as you archive and backup all those terribly interesting digital photos and videos!.

If you are like me you will just download and store all the charts that you can get your hands

…….Click Routing 6 of 7 : A Chart by any other name… …. to continue reading


Routing 5 of 7 : Algorithms

At last we come to the heart of the issue at hand, the optimal routing algorithm.

This is where the software must now manipulate:

The planning criteria such as waypoints, arrival time, departure times and so on Real time instrument data, and any fine tuning parameters stored by the user eg. True wind adjustments Boat characteristics and polars either general or specific to the boat Tidal stream data both general from charts and specific based on local knowledge or higher quality data from the supplier Weather data both actual and forecast Collision avoidance such as AIS, MARPA, charted obstacles, user

…….Click Routing 5 of 7 : Algorithms …. to continue reading


Routing 4 of 7 : Boat characteristics & learning to Wally!

This is part 4 of the quest for the best optimal routing calculations within ECS/ECDIS systems today. In this posting I wanted to consider the use of polar diagrams and data that represents the performance of the boat in a variety of wind conditions.

Of course wind cannot be taken in isolation when comparing your actual boat performance against any given polar diagram. The manufacturers polar diagram will tend to be an idealised version of what your boat will do at its design weight and under good sea conditions. The most likely source of polar

…….Click Routing 4 of 7 : Boat characteristics & learning to Wally! …. to continue reading