Wizkids Rules!

When I activate Geordi La Forge in an Enterprise NX and my dial shows a 3 ahead can I increase my speed to a 5 ahead?

Even if this is not on my dial?

Or can I use him only so slow down to a 1 straight ahead?

Geordi does not require the modified maneuver to be on the ship's maneuver dial. The only requirement is that the template for the maneuver must exist. If you modified a 5 straight to a 7 straight, you could not perform that because there is no such maneuver template.