I don't think the combine needed any hints on their location... I would believe that the mile-long smoke cloud from the rocket should pretty much be a dead giveaway.
I've done it. Sort of... I've put the little bugger in the rocket and launched it but the achievement wasn't unlocked. Other people have completed it though and it unlocked for them so I guess it just got bugged out for me. Luckily I have a save right before I put him in so I guess it won't be...
So have anyone successfully launched the gnome?
I just did it but the achievement wasn't unlocked :(
Dragging him along with the car being chased by a helicopter was just ricockulus
Traveling...
There there dog. Give him back now
On our way down...
One small step for gnomekind
Strapping...
Carting around the gnome is quite fun but it really sucks when you get the car... I can't find a way to get it to stay inside the car so I keep shooting him away a bit with the grav-gun, drive forward, stop, shoot it with grav-gun, drive, stop...