Question regarding distant visual contacts on Nav map with GW.

Here's my problem: I'll site and lock (L button) a distant (in excess of 4km+) contact with the periscope. By the time I switch to the Navigation map to mark the spot of the contact, I can see the little red square with tail disappearing from the map. Obviously, the lock mechanism is going off as I switch to the Nav screen but it seems to me that the little square contact mark should stay on a little bit longer. When the contact gets closer, the periscope will stay locked all the time and the problem therefore does not exist, but I like to have the targets course, the intercept course and AOB figured out well before this close range. It seems to me that in the stock SH3 the contacts stayed on the screen longer than in GW.

Is there a way to go into any of the cfg files and increase this detection time? If that'is even what it's called.

Any ideas or help would be appreciated.