If you have the Bavarian Sea Heist expansion, once you unlock the boat invaders challenge, the Eden Spark is pretty easy to unlock every gear for. The eDEN Spark is the Hammer of Dawn like weapon that you get at the end of the dlc.
Once I ran through it once I had three gears, I exited the challenge screen, and applied those mods, and the second try I got 5 gears.
Trikke den 1e provides the values in his staying power solution:
- Transport Boat : 500
- Corvette : 1000
- Heavy Patrol Boat : 2000
- Light Patrol Boat : 3000
- Helicopter : 8000