Mojo
Mostly harmless
Ok, so I decided to use the free openseamap service and lay out some routes. Note - I did not bother to get it down to the smaller details when it comes to navigating either the Stockholm Archipelago or the exact route out of the Tallin harbor. The positions are not exact either, since I positioned the waypoint just using drag and drop.
I just couldn't be bothered to go down to the boat and plotting it for real in the commercial chart plotter solution (Transas NaviSailor) that we use onboard.
So first of all, here is a rough picture showing the full route as it's described in JAIC. That includes entering the Stockholm area using the northern (Söderarm) entrance, since that one is not as hard to navigate in bad weather.
[imgw=800]https://i.postimg.cc/h45f8KDM/Estonia-1.jpg[/imgw]
The total distance of the trip is about 222 NM.
Then we have the part of the route up to the wreck site.
[imgw=800]https://i.postimg.cc/vBpDsvSk/image.png[/imgw]
The distance traveled to reach this point is around 96NM.
96/222 is around 41%.
But let's check the "as crows fly" distance also. I don't know why, but...
A straight line between the two cities:
[imgw=800]https://i.postimg.cc/15d7ZV96/image.png[/imgw]
So that's about 204NM.
And a straight line to the wreck site:
[imgw=800]https://i.postimg.cc/C5Gk5KXF/image.png[/imgw]
That's about 93NM.
93/204 is around 45%.
I can't see that this can be called any form of exact "midpoint".
Perhaps "military precision" is a bit like "military intelligence".
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