How do you find range using hydrophone and sonar?

[Realplayer]

Hi Subsim freaks,

i play GWX and have November 1943 and it starts to get hard (manual targeting etc.)

My litte problem is to find out the range to a sonar contact when the sub is submerged and i have no visual contact. I try to ask the sonarman - normal and "accurate" - and i try the sonar button, my u-boat is of course equipped with sonar.

But: all three methods result in similar, but wrong solutions. if i hit the sonar button repeatedly, the range gets longer and longer, even when i am sure that the contact is moving towards me. Most of the time range is shown between 4 km and 6 km, even if it is much closer.

How do you handle this? I must keep a long distance to the contacts before i dive, otherwise the dd's detect me with their radar and hunt me.