Add the vectors
1. 6.0m N and 4.0 NE
2. 6.0m N25E and 4.0 E
6.0 N = (0.00,6.00)
4.0 NE = (2.83,2.83)
2.0 N25E = (0.85,1.81)
4.0 E = (4.00,0.00)
Now just add 'em up and convert back to distance and heading
1. 6.0m N and 4.0 NE
2. 6.0m N25E and 4.0 E
4.0 NE = (2.83,2.83)
2.0 N25E = (0.85,1.81)
4.0 E = (4.00,0.00)
Now just add 'em up and convert back to distance and heading