A unit of magnetism 10.0E-09 tesla, equivalent to a gamma (10.0E-05 gauss).
Simply, the units in which magnetic survey maps are often contoured. 1 nanotesla = 1
gamma. A unit for stating the magnitude of the magnetic field vector B represented by the number of lines of induction passing through a unit area perpendicular to the vector direction.
1 nanotesla = 10-9 tesla
=10-9 weber/m2
=10-1 lines/m2
=10-5 lines/cm2
=10-5 gauss = 1
gamma