Originally Posted by unbusted67
In short, is there an alternative to spending a ton of money
Learn your bubbles!
Look over the side and see what your bubbles look like and their apparent speed going backwards. Learn your wake and maybe even take photos.
Perhpas borrow a handheld GPS
out for a day without current
and do speed runs checking your bubbles and wake pattern.
I sure as hell don't need to look at the instruments to determain speed through the water. I can even do it in the forward head
taking a pee by the sound of the bow wave (and the jiggle of the piddle)
Sure you might not determain 6.45kts but you will know the difference between 4 and 6 kts.
What is probably most accurate to me is knowing the basic miles per day I will get: a good day with good breeze up the butt = 150 miles per day. Normal is 140 miles; slower is 125nm, dead slow is 100 miles. Funnily enough they equate to aprox 6.5kts, 6kts, 5kts and 4kts.
With a bit of careful observation you can do it all without the waste of space, big fish
lure of a taff rail log, or Raymarine