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Did I miss something getting nasty? (gps thread)

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Old 08-09-2002, 09:09 PM
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Quote:
Originally posted by thisistank
My question is....does the current affect the gps reading??
No it doesn't ... the GPS will ALWAYS tell you how fast you are moving across the ocean floor.
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Old 08-09-2002, 09:09 PM
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No, no, no, I say if you sit in the current and float 10 MPH then you are going 10 MPH....I want to know will a gps read false going down a 10 mph current river?? I guess you and me are going to have to take a trip to havasu and find out!!
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Old 08-09-2002, 09:10 PM
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ahhhhhh, see we are on the same page!

I have to roll, I'll be back in a few....
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Old 08-09-2002, 09:15 PM
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Quote:
Originally posted by thisistank
ahhhhhh, see we are on the same page!

....
Not yet ... you haven't told me how fast my boat is in the 10 mph current. If you say 75 mph, then we are on the same page. If you say 85 mph, then I should be able to list it as being ABLE to run 85 mph on GPS.
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Old 08-09-2002, 09:16 PM
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Default That was an interesting and fun thread.

I posted this morning and was unable to check it unitl now and it is gone. Anyway I plan on taking my boat to a river that is flowing two or three MPH and running WOT down stream so I can have a 100 MPH boat. The best I can get is 97.8 GPS on my lake that has no current or flowing water. I was going to build my engine up to try and get to the century mark, but this way will be much easier and cheaper. Does anyone know of a river that flows 7 or 8 MPH? If so I will run there and maybe then I will have a 105MPH boat. Cool!!!
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Old 08-09-2002, 09:17 PM
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See Tank .... me and Wette Vette are on the same page
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Old 08-09-2002, 09:22 PM
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Wette Vette ... The Colorado River moves pretty fast

As a matter of fact ... when Bob Teague ran the Eliminator something like 140 mph on the Colorado River..... I'd be willing to bet he was running DOWNSTREAM
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Old 08-09-2002, 09:32 PM
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Default Cool, I'm there!

Maybe I will see three digits out of this old tub afterall. Tank, the satellites don't know how fast the river is going.
But the GPS speed is how fast you are going, so run downstream and get the extra MPH. I wonder if I am going to need a new prop now? My efficiency should be pretty good since I will pick up speed with the same prop and RPM as on the still lake. Cool again!!
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Old 08-09-2002, 09:57 PM
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In the last thread it was discussed about the gps not being able to know the correct distance traveled down or up hill. What if there is a current but also a change in elevation in the water? Like over a waterfall...yeah
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Old 08-09-2002, 10:47 PM
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Guys, Guys, Guys,

Whats there not to understand?

GPS speed is your true speed across the face of the EARTH.

Your pito boat speedometer's speed is your true speed across the surface of the WATER.

Water can move around on the earth's surface so there will be a difference in the two.

Not taking into account the accuracy problems associated with a pito base speedo, (plus or minus 4 mph), it is a more accurate indicator of the performance of the boat if you are running in moving water.

Just because the GPS says your boat does 80 mph going down river does not mean it will go 80 mph in still water.

To know what your boat runs in a river with a current take the GPS speed downriver then take the GPS speed upriver. Average the two and that will give you what the boat is capable of in still water.

Same thing on an airplane. You have the GPS speed and the airspeed. They are different because of the wind.

What's so hard to understand?

Oh and a GPS does measure altitude and correct your speed from there. Its 3 dimension navigation.

Ron

Last edited by rjcardinal; 08-09-2002 at 10:49 PM.
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