From CinC Fleet:
"Dear Nelson. When you get home, indent for Qty 1 x Garmin GPSMAP 188 Sounder which combines chartplotter and sounder capabilities in one unit, with split-screen capability so you can view your position and sounder information at the same time. That way you will both know where you are AND know where the rocks are as it also has a world-wide marine database. Costs Ł660 incl. VAT.
Then teach your successor how to use it. Also how to use those jolly expensive wirelesses to tell people where you bŁoody well are when asked!
Love,
Admiral Sir Hugh W B Keele-Haughle"