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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > gps navigation
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Thread: gps navigation Reply to Thread
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Topic Review (Newest First)
08-29-2013 09:57 PM
hellosailor
Re: gps navigation

knots, if you've gotten rusty at it, I would say the one thing you need to be aware of is the choice of datums and co-ordinates. In theory all GPS charts in the US will be WGS84 datum and every GPS and program will be preset to match that. In practice? Especially with your older GPS that may have been switched, so never assume the chart and the GPS datum match.

Also, your GPS may be set up to display in DD.MM.SS format, or DD.MM.mm format, and sometimes you can't tell which. Make sure it is reading degrees-minutes-seconds, or all decimal degrees (there ISO engineering standard is simply degrees to five decimal places) or whatever everything can agree on.

As to how to use software or calculate distances and all that good stuff...well at least there, it is usually obvious if something is wrong. But the datum mismatch or format can really slip past you.

There are, or at least recently were, still parts of the US using the NAD27 datum, and if your chart is on that, your GPS can be off by 1/3 of a mile versus reality. Never assume the chart is right, just because the box makes it look precise.
08-29-2013 09:52 PM
tdw
Re: gps navigation

Quote:
Originally Posted by sawingknots View Post
btw is there any way of blocking the sailnet chat feature? believe it or not i'm really not the chatty type and i'm tired of forever accidently going there,plz tell me how and just forget I even asked about navigation!
From what I understand you cannot block the damn thing permanently but if you turn it off when it first appears it will stay turned off for some considerable time. Not sure why but eventually it will pop back up again. Only takes two clicks to kill the thing. "Chat With" and "Turn Off".
08-29-2013 09:39 PM
aeventyr60
Re: gps navigation

Quote:
Originally Posted by sawingknots View Post
I doubt the crowd around my dock has ever even been more than a mile or two away from my marina,a trip down to the next lake would be a major event in fact some rarely leave their slip I seriously doubt any could give me any pointers concerning navigation,somehow I've always managed to muddle myself to where I want to go
Well, then, best you be muddling to clearer waters.
08-29-2013 09:07 PM
PaulinVictoria
Re: gps navigation

Hah, it's OK mate, I don't take offence, don't worry about it. I'd still love to know where you ended up, accidental p0rn is always the best sort.
08-29-2013 09:03 PM
sawingknots
Re: gps navigation

thanks again,the gear thing worked
08-29-2013 09:02 PM
sawingknots
Re: gps navigation

paulinv,i really meant no offence to you! I was just irritated and frustrated,trying to get rid of the virus,thanks for your [hopefully] understanding
08-29-2013 08:54 PM
PaulinVictoria
Re: gps navigation

Click on the list showing people here, click on the gear icon, click turn off. Usually stays off for a while until a cookie gets reset or the site has some work done.
Don't search for anything though, you never know where you are going to end up.
08-29-2013 08:51 PM
sawingknots
Re: gps navigation

btw is there any way of blocking the sailnet chat feature? believe it or not i'm really not the chatty type and i'm tired of forever accidently going there,plz tell me how and just forget I even asked about navigation!
08-29-2013 08:45 PM
sawingknots
Re: gps navigation

I doubt the crowd around my dock has ever even been more than a mile or two away from my marina,a trip down to the next lake would be a major event in fact some rarely leave their slip I seriously doubt any could give me any pointers concerning navigation,somehow I've always managed to muddle myself to where I want to go
08-29-2013 09:29 AM
aeventyr60
Re: gps navigation

Quote:
Originally Posted by sawingknots View Post
thanks,i can navigate with what I have,after today I think i'll stick with that lol
Yo knots, good time for you to have a face to face with some of your dock mates. Somebody can show you the ropes. Not real difficult once you get the hang of it. It will beat the heck out of a social networking experience.
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