[gurps] [VEHICLE] of the week 731 ? Planetary Defense Battery

[Onno Meyer]

> > On the other hand, -1 per yard would mean a nominal range around 70
> > million miles, certainly a no-go.
> 
> -1 per yard is for water with a substantial amount of mud or silt. Clear 
> water would be -1 per 5-10 yards. There should be another -1 for surface 
> effects.

Found a rule in TS:Under Pressure. Basically the rules you suggest, not
those from VE, but with less severe modifiers, -1 per 2-25 yards, with 
the lower range near the coast and the higher range on the open ocean.

Call it up to -20 or -25 for a sub at 500m in the deep ocean or near the 
bottom anywhere else - as the bottom depth and hence the maximum
dive depth goes up, the water becomes murkier, too . A ladar with 500 
miles nominal range should do the job if there is no stealth. TL9 
countermeasures mean 5,000 miles is more like it ... that would be 
the set of a large starship or a specialized sub-hunter.