Thanks for you replay but already know that
As an example this is Quest 155 - Find Sir Windawood (in Talking Island Village)
quest_begin tag=1 id=155 level=1 title=[Find Sir Windawood] sub_name=[Find Sir Windawood] desc=[Guard Abellos tells you that an urgent message has arrived from Gludio Castle for Sir Collin Windawood, the Consul of Talking Island. He asks you to deliver the message to the Consul near the Obelisk of Victory.\n] goal_id={} goal_type={} goal_num={} target_loc={-100155.0;238092.0;-3573.0} add_target_locs={} q_level={} lvl_min=3 lvl_max=6 journal_disp=3 entity_name=[Obelisk of Victory] get_item_in_quest=1 unk1=1 unk2=1 start_npc_id={30042} start_npc_loc={-82659.0;244992.0;-3717.0} q_requirement=[No Requirements] quest_intro=[An urgent message has arrived from Gludio Castle for Sir Collin Windawood. Sir Windawood, more likely to be found out on a stroll than in his office, hasn't seen it. Find Sir Windawood and deliver the letter to him.] class_limit={} have_item={} or_and=1 cleared_quest=0 mark_type=0 search_zoneid=30 iscategory=1 reward_id={734} reward_num={1} pre_level={0} faction_id=0 faction_level_min=0 faction_level_max=0 quest_end
quest_begin tag=1 id=155 level=-1 title=[Find Sir Windawood] sub_name=[] desc=[] goal_id={} goal_type={} goal_num={} target_loc={0.0;0.0;0.0} add_target_locs={} q_level={} lvl_min=3 lvl_max=6 journal_disp=3 entity_name=[] get_item_in_quest=1 unk1=1 unk2=1 start_npc_id={30042} start_npc_loc={-82659.0;244992.0;-3717.0} q_requirement=[No Requirements] quest_intro=[An urgent message has arrived from Gludio Castle for Sir Collin Windawood. Sir Windawood, more likely to be found out on a stroll than in his office, hasn't seen it. Find Sir Windawood and deliver the letter to him.] class_limit={} have_item={} or_and=1 cleared_quest=0 mark_type=0 search_zoneid=30 iscategory=1 reward_id={734} reward_num={1} pre_level={1} faction_id=0 faction_level_min=0 faction_level_max=0 quest_end
L2ClientDat give you what every fields (or most of them) is. target_loc its obviously where to go next, but the arrow points in other direction.
-100155.0 ; 238092.0 ; -3573.0 are right, its where the NPC is and its show correctly un MiniMap (Alt+M) and in RadarMap, but the arrow goes to -80766.0 ; 247608 ; -3632.0
And of course, cant find those coords in any other dat file