How to use gnu plot to plot circles with vectors indicating direction?

Question

I have a data file like this:

1  1.680  24.250 0.1 0.0  1.830  24.250
2  6.330  24.860 0.1 30.0  6.460  24.935
3  9.440  24.320 0.1 60.0  9.515  24.450
4  12.110