I used Google Earth to plan our trip to Southampton in the UK which never materialized. When a friend asked us to help him plan a circumnavigation of Ireland, I returned to Google Earth to work out the distances around the west coast with which our friend is unfamiliar. This way I could point out the places where there's nowhere to find shelter for big enough distances to worry about the weather. I found it to be really easy but I forgot to get a screengrab when it was all done, so I'll have to do it again. In the meantime, here it is for reference. NOT FOR Navigation. The miles really add up when you have to go in and out into anchorages and harbours.
Distance from Start (not point to point)
Crosshaven to Kinsale 
                 17 NM
Kinsale to Glandore                       48
NM  (Alt Castletownsend)
Glandore to Sherkin Is                   66
NM
Sherkin to Schull                            81
NM
Schull to Crookhaven                     92
NM
Crookhaven to Bere Is                  116
NM (Alt Bantry - SCH)
Bere Is to Valentia Is                     171
NM (Alt Dingle - marina)
Valentia Is to Inis Mor 
                 256 NM (Alt Kilrush,
Shannon  or Rossaveal, Cashla Bay – SCH)*
Inis Mor to Inisbofin                     302
NM  (Alt Killary Hbr – long way in to
anchorage)
Inishbofin to Clare Is                    322
NM (Alt Achilbeg or Rosmoney - Westport)
Clare to Blacksod                          349
NM (Alt Inishkeas in settled weather)
Blacksod to Broadhaven               380
NM 
Broadhaven to Teelin                    431
NM (Alt Killybegs in Str S - SCH)*
Teelin to Arranmore Is                  473 NM (Alt Gola Is)
Arranmore to Sheephaven Bay     504
NM
Sheephaven to Loch Swilly           523
NM





