[Rhodes22-list] Rhodes 22 does 17.6kts !!!

[Mary Lou Troy]

Actually by showing you speed over ground and your exact position it 
accounts for both in a sense. What our handheld GPS doesn't do (don't 
know about the fancier ones) is give you a compass reading or show 
you speed through the water - it only gives SOG and the direction you 
need to go to get to a waypoint.

Mary Lou
1991 R22 Fretless
Rock Hall, MD

At 11:51 PM 6/24/2007, you wrote:
>A GPS can't substitute for local knowledge nor if is configured 
>primarily for land use has limitations for marine. Can a GPS account 
>for tidal currents or leeward drift on a beat? Please enlighten we 
>old chart and parallel rulers users!!
>   ----- Original Message -----
>   From: John Lock<mailto:jlock at relevantarts.com>
>   To: rhodes22-list at rhodes22.org<mailto:rhodes22-list at rhodes22.org>
>   Sent: Sunday, June 24, 2007 2:53 PM
>   Subject: [Rhodes22-list] Rhodes 22 does 17.6kts !!!
>
>
>   Now that I have your attention...  that's what my GPS reported on
>   Saturday afternoon.  We were sailing in light wind, but the GPS was
>   reporting speeds all over the place - sometimes 1.5, then 6.4, then
>   3.5, then 0... all within a matter of seconds.  Clearly this was not
>   trustworthy.
>
>   I turned the GPS off and back on again, figuring I'd unscramble its
>   brains that way.  No good, still got wacky speeds reported, even
>   though our progress was pretty steady and I'd guess around 2.5kts.
>
>   So... we decided to go visit a friend on the lake and called him up
>   to see if he's home. "Sure, come on over!", he says, " but my
>   satellite service is down, so no TV".  Aha!  Now the pieces come
>   together - solar activity must be mucking with the satellites.  It
>   was a good lesson on the limitations of electronic  gear.  I wasn't
>   tracking position, so I can't tell if that was whacked too, but I'm
>   guessing you couldn't trust it either based on the confused speed
>   reports I got.
>
>   Don't throw away your paper charts just yet ;-)
>
>   Cheers!
>
>   John Lock
>   ~~~~~~~~~~~~~~~~~~
>   s/v Pandion - '79 Rhodes 22
>   Lake Sinclair, GA
>   ~~~~~~~~~~~~~~~~~~
>
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