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what do you mean with this  I extensively use zigzagging convoys in my SH3 installation and it's quite effective (around every 16km and an angle variation of +/-25°). I've also never seen a broken convoy 
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There are two types of zig zag that the convoys did in real life:
1) Helm change, where the formation would keep the general course, but for some minutes changed helm to a different heading (returning to the original main course inmediately after that). There were alarm clocks at the helmsman station that ringed f.e. every 5 minutes to remind the helmsman to change course again. This was done to avoid incoming torpedoes and difficult the uboat ascertaining the real true course.
2) Complete course change, where the whole convoy would steer a different course altogether. While doing the 5 minutes helm changes around it, of course. This was done to shake pursuers and confuse about the real course steered in the long run.
In the first case, because alls hips changed heading simultaneously, the aspect of the formation (viewed from above) changed accordingly, for example a perfect square would become a rhombus or diamond when they all change helm 45º
In the second case, the whole formation changes course and the ships on the outside must speed up to catch the relative position they had to the rest before. This happened every as many hours as the convoy commander decided and usually always at least once after dark so as to lose any pursuing uboats easier.
SH3/4 can only do the second thing.