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Do GPS maps include speed data?
Posted: Wed May 05, 2010 4:04 pm
by argonaut
I still use my old faithful Lowrance H20 to keep from bumping into things.
But these handheld Garmins like the Oregon 400C are intriguing.
Can you download your tracks onto a PC after a day of sailing, and if so does the track include speed data?
If you could click on a point and see your boat's speed, now that's pretty cool. Even better if the wind data could be there too.
On a separate rant, how come wind speed devices are so ridiculously expensive? It's like a $1K deal just to be able have a windgauge to see apparent wind.
I mean, it's a propeller and a wind vane. Seriously? A grand? I mean an ST70 is cool, but holy cow!
OK, that's it for my Andy Rooney imitation.
Re: Do GPS maps include speed data?
Posted: Wed May 05, 2010 6:26 pm
by Russ
argonaut wrote:On a separate rant, how come wind speed devices are so ridiculously expensive? It's like a $1K deal just to be able have a windgauge to see apparent wind.
I mean, it's a propeller and a wind vane. Seriously? A grand? I mean an ST70 is cool, but holy cow!
OK, that's it for my Andy Rooney imitation.
I got one like
this on eBay for about $25 bucks.
Re: Do GPS maps include speed data?
Posted: Wed May 05, 2010 6:34 pm
by Retcoastie
My Garmin 76cs will not record instant speed data. Sorry.
Re: Do GPS maps include speed data?
Posted: Wed May 05, 2010 6:50 pm
by daydreamerbob
i don't know if my lowrance does or not -
but my garmin forerunner 305 running watch sure does. think you can get one for $175 or so these days.
Re: Do GPS maps include speed data?
Posted: Thu May 06, 2010 3:54 am
by Catigale
Retcoastie - sure it does. Ive downloaded track/speed data from the Garmin 76 many times, unless they have changed the software??
Re: Do GPS maps include speed data?
Posted: Thu May 06, 2010 6:39 am
by Retcoastie
Okay, I've been chastised, now I'm ready to be enlightened. I am looking at several tracks that I recorded and don't have a clue as to how to locate any speed data. I'm looking at Garmin GPS Database files labeled "Wilson Lake Run.gdb" with the Garmin Mapsource program. It has a nice track, but speed info, if there, is hidden to these old eyes.
Please instruct this humble toad.
Ken
Re: Do GPS maps include speed data?
Posted: Thu May 06, 2010 7:41 am
by grady
I believe when you are replaying a GPS track on the computer the computer is calculating speed from your track time and distance. so you do have speed but it is not tagged in the data.
Re: Do GPS maps include speed data?
Posted: Thu May 06, 2010 8:09 am
by Catigale
Okay, I've been chastised, now I'm ready to be enlightene
Chastising is free, enlightenment costs extra...
Ill see if I can C&P some track files from my trips and see what is in there.