The viper uses Absolute targeting when you don't slew the SPI, the bomb just loads the coords from the stpt into the bomb. If you slew then it goes into relative targeting
If you depress and hold the stick pinky switch it activates HSD ZOOM which goes to centroid and the lowest zoom level to see your flight. Useful for formation management
OFF shouldn’t actually be an option and it should default to L-16. And that setting only selects what link you want to SEND AG data through. Doesn’t affect receiving nor does it affect anything except AG transmission