[moose1am]

This is by design. The precision of locating a ship on the map was poor back in the WWII. The ruler in the Navigation Map is not meant for measuring ranges (with great precision).

Precision is the wrong word to use here. You should use the word "accuracy" in this phrase above.

Accuracy is what you are tying to infer.

Precision is when you can repeat the same thing over and over again the same way.

You can play darts and miss the target completely with ever dart and be precise if all the darts hit in the same area outside the target.

To be accurate you must hit the bullseye in the center of the target. To be accurate and inprecise you can hit the bulls eye with a few darts and miss the target with a few darts. Those darts that all hit the bullseye were accurate throws but your precision is off because all the darts landed in different areas of the wall. Some hit the bs and some missed the bs .

To be accurate and Precise all the darts must hit the bullseye.

You precision can be excellent and the accuracy is way off at the same time when all the darts land out side the target area but all in the same spot.

If your darts all miss the target but area scarttered all over the way then you are both inaccruate and Imprecise at the same time.

I hope this discussion of the meaning of accurate and precise helps people use these terms properly.

These are two different words and they have entirely differnet meanings.

Say you fire at a moving ship and miss by 1000 yards with one torpedo and 500 yard with the second torpedo and then miss again by `1500 yards with the last torpedo. Now you would say that you were not only inaccurate in your aiming but your precision was way off too.

Now if you fired three torpedoes at a ship and miss by 1500 ft in each case you could say you were inaccurate but very precise. You repeated the mistake the same way in each shot. But all three shots missed the target.

Now if you hit the target with three straight torpedoes you would be accurate and precise.

Now do you folks see the difference in the meaning of these two words?

I gave examples to make it more clear to you.

Most people just use the term precise to mean accurate but that's dead wrong. They don't have the same meaning. I can be precise and still inaccurate.