Open CPN Hot Keys
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 Arrow Keys,    Moves the chart view
 + or Ctrl + Z Zoom In
 - or Ctrl + X  Zoom Out
 F2    Toggle Auto Follow ON/OFF
 F3 or Ctrl + S   Show / hide ENC Text
 F4    Starts the measure tool. Escape : Stops it.
 F5    Toggle Screen Brightness
 
 F7 or Ctrl + L-Arrow  Larger Scale Chart (Scale In). 
 Selects charts on the Status Bar right to left.

 F8 or Ctrl + R-Arrow  Smaller Scale Chart (Scale Out).  
 Selects charts on the Status Bar left to right.

 F11   Opens Grib Dialog
 F12 or Ctrl + O    Show/Hide Chart Outlines
 Ctrl + L-Arrow or F7   Larger Scale Chart (Scale In)
 Ctrl + M   Drop Marker at current cursor position.
 Ctrl + O or F12 Show/Hide Chart Outlines
 Ctrl + Q   Quits OpenCPN
 Ctrl + R-Arrow or F8   Smaller Scale Chart (Scale Out)
 Ctrl + S or F3 Show / hide ENC Text
 Ctrl + X or - Zoom Out
 Ctrl + Z or +    Zoom In
 Ctrl +space Man Over Board, sets MOB Marker at current GPS position.

Alpha listing of Hot Keys
 Auto Follow ON/OFF   F2
 Chart Outlines, Show/Hide    F12 or Ctrl + O
 ENC Text Show / hide    F3 or Ctrl + S
 Grib Dialog   F11
 Larger Scale Chart (Scale In)   F7 or Ctrl + L-Arrow
 Man Over Board at current GPS position    Ctrl +space
 Measure tool. Escape : stops it    F4
 Moves the chart view   Arrow Keys
 ENC Text Show / hide    F3 or Ctrl + S
 Quits OpenCPN Ctrl + Q
 Selects charts on the Status Bar right to left. F7
 Selects charts on the Status Bar left to right. F8 
 Screen Brightness    F5
 Smaller Scale Chart (Scale Out)    F8 or Ctrl + R-Arrow
 Zoom In + or Ctrl + Z
 Zoom Out - or Ctrl + X