Sonar Man and Watch Officer Info

I've been thinking, not a good idea I know but hey. Anyway, two real "pains" with SH3 are:

1. The Watch Officer provides range estimates that are too accurate (+ or - 100m I think)

2. The Sonar Man provides range estimates that are too vague:
Short Range <=1000M
Medium Range 1000 to 5000
Long Range 5000 to 17000

(I may have the figures wrong so please feel free to correct me)

I would like to see more realistic "situation awareness" when attacking convoys. For this I would require:

1. The Watch Officer's range estimates to be less accurate the greater the range.
2. The Sonar Man's range estimates to be more accurate the close the range.

I believe the Watch Officer's estimation can't be changed (was discussed a year ago or more)

Can the Sonar Man's estimates be broken down to:

Long Range => 10000 to 17000
Far Medium Range => 5000 to 10000
Medium Range 3000 to 5000
Near Medium Range 1000 to 3000
Short Range <= 1000


If the latter can't be done then I wonder if it would be possible to have map updates on, ensuring the ship positions are vague on the nav map. If I remember rightly, some work was done on this in NYGM, and maybe GWX too but i'm not sure.

The goal is to allow the commander to have a better situation awareness of ship positions but not be able to use them for target data aquisition (i.e. still be forced to use optics to estimate range and speed...especially range).

Not sure if i've made myself clear, let me know if not.

Thanks.