Hey, I've made progress with some of the weapons. I am working on the GPS "weapon". I found in the addon ideas section of the forum a script for a bulletproof vest which seems to do the trick
[playername] exec "bodyArmour.sqs" //Put this in the player's init feild of who gets the weapon.
Then the script:-
_player = _this select 0
_startDamage=(_startDamage + _endDamage) / 2
_player setDammage _startDammage
This will check for changes to the dammage of the player every 0.01 seconds and halve it. You live longer basically. But, like a real bulletproof vest, 1 headshot will kill you. Now all we need is a picture for it to put in the Gear section of that book thing in OFP next to the map. And that's one down!