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Old 08-11-2008
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The GPS disappointment

Why isn't this in the gear section? Because the GPS worked fine, but the brand and model is a low end handheld really more for hiking there isn't much point in promoting it with a review. I plugged in where I wanted to be and it showed the direction to go in and a map of where I have been and all that. So why am I disappointed? Hint - I never had a GPS on board this boat before.
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Old 08-11-2008
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Andy-

If it is a low-end TERRESTRIAL GPS, it really isn't going to do much more than what you just said. There's a huge difference between a GPS and a Chartplotter.

BTW, handheld GPS units are great if you have one on-board and plot the positions on your chart. Just make sure the chart datum for the GPS is set properly. Most modern charts are WGS84, which is what most GPS units default to, but there are some odd charts out there.
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Old 08-11-2008
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Actually, SD, there is at least one more thing it does and it did it correctly and my disappointment is not with the GPS...

I have charts, but the map in the little handheld was actually reasonably accurate as far as shape of the shoreline and it had Indian Island, where I sailed to, on the map. It's not very big and uninhabited so it was a pleasant surprise to find it on the terrestial GPS.

Another hint - reality bumped my perception hard enough to give me a little ego bruise...
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Hmm... did you go aground???
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Quote:
Originally Posted by sailingdog View Post
Hmm... did you go aground???
No, at least not by accident...



I was able beach on Indian Island due to my shallow draft.

A GPS does not measure water depth anyway, but it does measure something I had never measured before...
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Old 08-11-2008
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A GPS isn't supposed to measure water depth. Does it provide altitude with respect to sea level?
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Old 08-11-2008
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Ego bruise, hmmmm? Not going quite as fast as you thought, perhaps?
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Ego bruise, hmmmm? Not going quite as fast as you thought, perhaps?
We have a winner!

Yup, I sail at between 3.5 and 5 MPH most of the time. I would have guessed (and did) more like 5 to 7. My motor pushes me at about 5. Interestingly enough, that I guessed about right. Sailing at 5 feels much faster than motoring at 5.
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One thing to remember with a GPS is that it measures distance over ground and calculates a speed. On the water we do have to deal with currents so our real boat speed through water can be lower or higher than the velocity made good of the GPS depending on outside factors.

John N.
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Quote:
Originally Posted by jnsailing View Post
One thing to remember with a GPS is that it measures distance over ground and calculates a speed. On the water we do have to deal with currents so our real boat speed through water can be lower or higher than the velocity made good of the GPS depending on outside factors.

John N.
I had no current to speak of, but I would still be more concerned about actual movement with respect to the ground, whether there is moving water beween me and it or not. If I try to fight a 6 kt current with my engine, I will not be going 5 MPH, I will be going 1 MPH in the wrong direction.
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