[Rhodes22-list] Magnetic or True? By a famous nautical author... Other th...

[Rory Orkin]

Hi Bill,
   I Use the 498 on my Rhodes.. I find that it is about the right size..I
think that is the same form factor as the 398. You would have to check..
Garmin has a very complete web site.
 I used the external mount antenna and used a 
Ram Mount to put it on the Starboard Bulkhead.. It seems to work.. I run the
power wire through the passageway 
to the unit.. I then store the unit in the cabin when not in use.
This is not the most elegant solution but I wanted to play with things
before I commited to the wiring.What you do with the wiring may be affected
by future plans to interface the gps with a DSC radio or autopilot
Perhaps a better way if you want is to get their flush mount kit . That
requires an external antenna to be mounted.. People have mounted on the
stern rail but I was not in love with the idea of putting it there because I
was concerned (needlessly perhaps) about it getting knocked off.
                        Hope this was of some help

                 The visibility of the GPS is good fom the tiller.
Remember.. Nothing happens all that fast that you cant stand up and take a
closer look..  The main problem with chartplotters is that the screen can
get washed out in some sunlight conditions. Mine seems adequate. But it is
not unlike other lcd screens.

bill davidge wrote:
> 
> Dave
>     What do you know or think about the Garmin  398? I'm just learning
> about Navigating in a Cost Guard  class and have a long way to go before I
> know which way to add or subtract the deg. to the Compass from the compass
> rose on the chart 
>  
>    Thanks Bill Davidge Temperance MI.
> 
>     
> 
> ----- Original Message ----
> From: "DCLewis1 at aol.com" <DCLewis1 at aol.com>
> To: rhodes22-list at rhodes22.org
> Sent: Tuesday, April 10, 2007 12:06:30 AM
> Subject: Re: [Rhodes22-list] Magnetic or True? By a famous nautical
> author... Other th...
> 
> 
> Bill and Ed,
> 
> I don't think it matters much if I were to try to sail a true heading as  
> magnetic, my chart plotting GPS  would straighten me out  quickly.  With a
> chart 
> plotting GPS I enter  my destination/way points on the electronic charts
> in 
> the GPS unit and  then  I  watch my track evolve in real time as I sail. 
> Of  
> course, I always try to start on the right magnetic bearing, since I steer
> via  
> compass, but it's not critical at all.  If I'm not headed where I want to 
> be 
> headed relative to my desired way point, the plot on my chart plotting GPS  
> will tell me immediately and quantitatively.   I can look at the  track
> display 
> that's automatically displayed (no transferring plot points)  and
> instantly 
> know if my course is too high or low and with that crude info  I can make
> a 
> steering adjustment, note the new reading on the compass,  and then hold
> that new 
> compass reading.  I  never make the  calculation to go from degT to degM, 
> instead I just note I'm off  track and adapt.  
> 
> As to deviation and variance, I'm not sure it matters when   a compass is 
> used with a chart plotting GPS.  The compass becomes a  relative
> instrument that 
> is used to hold a heading appropriate to keep on,  or near,  the desired
> trip 
> track, that's it.  The numbers on the dial  are just a way to help you
> keep a 
> heading - whatever that heading  really is, and that heading is ultimately 
> determined by your chart plotting  GPS.  Making progress to the next way
> point is 
> what's important, and you  can see that evolve (or not evolve) on the GPS 
> display.  Steering  accurately by compass, as per John Vigor, is now
> besides the 
> point - I use  the compass to hold a bearing that will keep me on my
> desired 
> track (or get me  back to my desired track) and that track is monitored 
> accurately in real time by  my chart plotting GPS.
> 
> And all of the above is accomplished without keeping my head down 
> navigating 
> via GPS because the chart plotting GPS unit does all of the  calculations
> and 
> plotting.  All I have to do is glance at the display  to see that I'm on 
> track or off track and if I'm off track what I have to do to  get back on
> track.  
> If I want to know quantitatively how far off-track I  am, speed, or
> whatever, 
> I have to change the display page - but that's pretty  quick & simple.
> 
> And with GPS I always know where I am (Lat/Lon) much better than the  
> paper-plotters.  I don't think there's any question about that.
> 
> Of course we should always know how to fall back to paper and pencil,  but
> I 
> think that fall back is a long ways back.  I think a chart plotting  GPS
> can 
> really be a very useful asset - and it can be an especially useful  asset
> at 
> night or in inclement weather (low vs).
> 
> Dave
> 
> 
> 
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