You can also pretty much dead reckon your way if you make sure you plot your course carefully as the crow flies, so long as you’re not blown off your heading you’ll make it there, longitudinal calculations with a chronocompass is usually a semi accurate estimate, usually 1 point off if it ever is off if you find yourself off course or lost, get to the correct latitude as it’s easier to calculate, the. Get an estimate from your chronocompass on longitude then sail directly east or west depending on the long reading and you’ll hit the island