Whisk together the soy sauce, water, brown sugar, and rosemary in a bowl, and pour 1/2 of the marinade into a resealable plastic bag. Add the pork chops, coat with the marinade, squeeze out excess air, and seal the bag. Marinate in the refrigerator for at least 3 hours. Set the remaining marinade aside.
Preheat an outdoor grill for medium heat, and lightly oil the grate. Remove the pork chops from the marinade, and shake off excess. Discard the remaining marinade.
Place pork chops on the grill and cook until the pork is no longer pink in the center, brushing occasionally with the reserved marinade, 4 to 5 minutes on each side. An instant-read thermometer inserted into the center should read 145 degrees F (63 degrees C).
Notes
The nutrition data for this recipe includes the full amount of the marinade ingredients. The actual amount of the marinade consumed will vary.