Ohhhh, you want to remove it from a current boat?? Even simpler...
Open this file: My Documents\SH3\data\cfg\Careers\*Your name*\
Careers_0.cfg The career # in the bottom of the file is always the most current one. For instance, look at this one:
[CAREER 004]
CareerNumber=0
Patrols=0
TonnageSunk=0.000000
MerchantTotalTonnage=0.000000
WarshipsTotalTonnage=0.000000
ShipsSunkNb=0
MerchantTotalShipsSunk=0
WarshipsTotalShipsSunk=0
PatrolCraftSunk=0
CorvetteSunk=0
FrigateSunk=0
DestroyerEscortSunk=0
DestroyerSunk=0
MineSweeperSunk=0
LightCruiserSunk=0
HeavyCruiserSunk=0
EscortCarrierSunk=0
AircraftCarrierSunk=0
BattleCruiserSunk=0
BattleShipSunk=0
MineLayingShipSunk=0
AuxiliaryCruiserSunk=0
PlanesDownNb=0
NbFlot=1
PlayerName=Rudolf Berke
PlayerRank=10
StartMonth=0
StartDay=0
StartYear=0
CrtMonth=0
CrtDay=0
CrtYear=0
CrtFlotilla=-1
CrtBase=757
CrtPort=-1
PortName=La Spezia
DeparturePointLong=2065057.000000
DeparturePointLat=4857121.000000
DeparturePointHeading=180.000000
Flotilla0=0
NbPatrolsInFlotilla0=0
StartYearInFlotilla0=0
StartMonthInFlotilla0=0
StartDayInFlotilla0=0
E01=NULL
E02=NULL
OffDead=0
PODead=0
SeamenDead=0
SubType=-1
SubVersion=-1
Z01=4
M01=1
<== make it a -1 to get rid of the deckgun
A01=7
A02=7
S01=-100
S02=-100
S03=-100
SuperChargerUpg=-1
BatteriesUpg=1265
HydrophoneUpg=1270
SonarUpg=-1
RadarUpg=-1
RadarWarningReceiverUpg=-1
Decoy_LauncherUpg=-1
SnorkelUpg=-1
SonarCoatingsUpg=-1
RadarCoatingsUpg=-1
ALB=-1
TAR=-1
ForeTubes=4
AftTubes=1
ForeResIntern=4
ForeResExtern=1
ForeResExtra=2
AftResIntern=1
AftResExtern=1
Renown=-522.000000
Finished=false
WarOver=false
Experience=0.000000
Medal0=-1
Medal1=-1
Medal2=-1
Medal3=-1
Medal4=-1
Medal5=-1
Medal6=-1
Medal7=-1
Medal8=2
Medal9=-1
ForeTube0=2
ForeTube1=2
ForeTube2=0
ForeTube3=0
AftTubes0=2
ForeResIntern0=2
ForeResIntern1=2
ForeResIntern2=2
ForeResIntern3=2
ForeResExtern0=2
ForeResExtra0=0
ForeResExtra1=0
AftResIntern0=2
AftResExtern0=2
AttackPeriscope=0.000000
ObservationPeriscope=0.000000
RadioAntenna=0.000000
RadarAntenna=0.000000
Hydrophone=0.000000
LRRadio=0.000000
Radar=0.000000
MainPump=0.000000
FuelTank=0.000000
StarboardDieselEngine=0.000000
PortDieselEngine=0.000000
StarboardElectricEngine=0.000000
PortElectricEngine=0.000000
Compressor=0.000000
BowTorpedoTubes=0.000000
BowDivePlanes=0.000000
ForwardBatteries=0.000000
AftBatteries=0.000000
SternTorpedoTubes=0.000000
SternDivePlanes=0.000000
RudderFort=0.000000
RudderStarboard=0.000000
PropellerFort=0.000000
PropellerStarboard=0.000000
DeckGun=0.000000
Snorkel=0.000000
FlakGun1=0.000000
FlakGun2=0.000000
FlakGun3=0.000000
ActiveSonar=0.000000
StarboardCreepElectricEngine=0.000000
PortCreepElectricEngine=0.000000
SternTorpedoTubes2=0.000000
SternTorpedoTubes3=0.000000
SternTorpedoTubes4=0.000000
BowTorpedoTubes2=0.000000
BowTorpedoTubes3=0.000000
BowTorpedoTubes4=0.000000
BowTorpedoTubes5=0.000000
BowTorpedoTubes6=0.000000
RadarWarningReceiver=0.000000
Sonar=0.000000
Decoy_Launcher=0.000000
Hydrophones_Receivers=0.000000