Gta 4 help!!!Please!!!!

1)What is the ''N'' symbol of the map represents? 2) When you get calls from ur contacts regarding missions, r they optional or compulsory?3) How do i get to the Heli-tour place?Gta 4 help!!!Please!!!!
1)What is the ''N'' symbol of the map represents? 2) When you get calls from ur contacts regarding missions, r they optional or compulsory?3) How do i get to the Heli-tour place?1)it means North2)Any time in game3)IDK hopefully someone else will. Gta 4 help!!!Please!!!!
1. North because no one else in the game has a name that starts with it.

2. If you do enough of the activities you'll unlock their special abilities which for some people are achievements and it will eventually get you the 90% achievement as well. If your friend calls you for a mission than you have to go to it.

3. I think it's when you unlock all islands or when you get the helicoptor from brucie. The heli-tour place is on the middle island btw.

To answer #3, the heli tour place is actually behind some dividers unless you are really good at driving i don't think you can get a car right to the heli, you have to get out. Also, you can swim there. Look for it on the south east side of Algonquin. its where some piers jut out into the river.