Nav Chart Markups Missing After Game Load

[glilley]

Been playing GWX and SH4 for years now playing twos - great work there! Got a little issue; I like to mark up the map with lines, radius and marks as aids to nav and hunting. In SH3/4, they are always saved on map when I save a game in progress and reload and only disappear when start new patrol. TWoS drops all my marks between saves (e.g., put in couple lines for convoy routes and an "X" for reported convoy posit, save game, reload later and only sunk ship markers and objective markers are in place and all my previous mark ups are gone). Is there a setting I need to change to keep these between saves? Thanks!