06-25-2018, 07:27 PM
Joe,
You're right- I forgot charts. A gnomonic would be a good idea or just a Mercator to mark the course traveled. An electronic knot meter might be best instead of a Log (thrown overboard and retrived). The knot meters that are towed often get devoured by creatures of the sea. Maybe I'd just use an hourly estimate of speed using this formula;
(Boat Length ÷ 6076) x (3600 ÷ Seconds)= Speed
Once you figure out the time in seconds as it applies to speed you can put the figures on a card and then time bubbles off the bow passing from bow to stern.
Yes, I'd use an electronic depth sounder around coastal waters but shut it off once at sea. Casting the lead isn't something I've been able to do well when trying to sail.
General charts of the ports-of-call would be sufficient. Years ago I found a site that had them for free (electronic) but I've since forgotten where the site was.
Roland
You're right- I forgot charts. A gnomonic would be a good idea or just a Mercator to mark the course traveled. An electronic knot meter might be best instead of a Log (thrown overboard and retrived). The knot meters that are towed often get devoured by creatures of the sea. Maybe I'd just use an hourly estimate of speed using this formula;
(Boat Length ÷ 6076) x (3600 ÷ Seconds)= Speed
Once you figure out the time in seconds as it applies to speed you can put the figures on a card and then time bubbles off the bow passing from bow to stern.
Yes, I'd use an electronic depth sounder around coastal waters but shut it off once at sea. Casting the lead isn't something I've been able to do well when trying to sail.
General charts of the ports-of-call would be sufficient. Years ago I found a site that had them for free (electronic) but I've since forgotten where the site was.
Roland