Help working out distance please

Update, I'm pleased to say we made the journey today without any issues:)

The sea was quite rough in places and visibility was poor but nevertheless we soldiered on and completed the journey in 6 hours. The boat felt really sure-footed and definitely a big confidence boost for me

So she's now in her new home in Weymouth and I can start cleaning and adding extras I want etc ☺

Once again many thanks for everyone's help and input
 
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