Thanks Trevally for explanations!
1. I think v.1.4 is undoubtedly worth to restart the game
2. I'm playing on full realism settings and following 'dead is dead', 'missed shot is a missed shot' rooles, so there is a big possibility of being sunk before all objectives of 'happy times' will be accomplished. In that case I'll start the new career with the new boat in next campaign period (with v.1.4 I hope

)
P.S. Its a pity there is no any video tutorial how to use/position sextan in SH5

. Going to obtain the celestial map to study really 'real navigation' while in open sea with no contacts spotted