Starships: Jumping For Dummies
1. Still within the 100-diameter limit: DM-4
2. In theory, you could jump from the centre of the Earth.
3. Or, just from the landing field, itself.
4. I sorta recall that there was an increased penalty within ten diameters.
5. Within one diameter, it should need a miracle.
6. It should be kept in mind, that most planetary bodies move in space, while they're also rotating.
7. The calculated point of departure on the surface, being the landing field, would be a constantly moving target.
8. Plus, the jump bubble would be half filled with the landing field's materials.
9. Which, presumably, holistically, has some gravitational properties.