Association Forum - GPS track analysis

Assn Members Area · Join

Home.

Association Forum

Ships Store

Cruising

Racing

Technical Tips

Photo Gallery - New

Boat Search - Updated

Manuals & Brochures

Swap Meet

Links

Officer Flag Line & Staff

Bylaws & Constitution

Members Area

Join the Association

Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.

Association Forum

Username:	Password:
Save Password
Forgot your Password?

All Forums

Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

GPS track analysis

New Topic

Topic Locked

Printer Friendly

Author

Topic

glivs
Admiral

Member Avatar

USA
836 Posts

Initially Posted - 09/16/2013 : 17:28:40

Just curious. Do racers have software to analyse GPS track data after an event, e.g., histogram of speeds by leg, ave speeds for a given time period or distance, course summaries, etc? The simple stats off my Oregon 450(Garmin) are useless. I'm not a racer, but on those great days, it would be fun to look back at performance. Thanks

Gerry Livingston, Malletts Bay, VT
"Great Escape" 1989 C-25 SR/WK #5972

Edited by - on

awetmore
Master Marine Consultant

Members Avatar

USA
1144 Posts

Response Posted - 09/16/2013 : 17:40:49

I like doing it with GPS Visualizer. It just makes webpages that look like this:
http://phred.org/~alex/maps/sailing/5-12-2012/

Note that the color is based on boat speed.

Edited by - on

Steve Milby
Past Commodore

Members Avatar

USA
5902 Posts

Response Posted - 09/17/2013 : 05:31:46

In the Governor's Cup race, (75 nm down the Chesapeake Bay) each boat has the option to carry a transponder, so that the position of each boat is recorded in real time, and interested people can follow the progress of each boat, and compare it to others. By analyzing your track after the race, you can compare it with the tracks of other boats, and see where you either gained or lost ground on the winning boats, or other boats with a comparable phrf rating. If you lost ground because you were in an adverse current or in a light air zone, you can see it clearly, and perhaps plan a smarter track next year. In the Gov Cup race, it isn't enough to sail the boat fast and efficiently. You have to navigate it well through the varying winds and changing tidal currents, gaining speed with a favorable current, and avoiding the effects of an adverse tidal current.

Edited by - on

dmpilc
Master Marine Consultant

Members Avatar

USA
4593 Posts

Response Posted - 09/17/2013 : 07:43:29

A Garmin GPS Map76 will track your course and you can review it in realtime or later.
For club racing and training, our club may purchase a software package next year that will do just that, so racers can compare how they sailed after the race. Skippers will be able to purchase an app, for about $10, that will work on a smartphone, making their phone the transponder. We demo'd it a few months ago. Pretty cool. Skippers will not be able to access ant data during a race, so there won't be any possibility of one boat having an advantage over another during a race, but all will be able to review results after returning to the clubhouse. I think the cost is around $1k. It's called Kattack, and here's a link to their website:
http://www.kattack.com/

Edited by - dmpilc on 09/17/2013 07:50:34

glivs
Admiral

Members Avatar

USA
836 Posts

Response Posted - 09/18/2013 : 17:04:53

I'm surprised there does not appear to be any open source package. I can plot tracks using GPS Visualizer, Open CPN, and GoogleEarth but I haven't found anything that offers descriptive statistics. Alex, thanks for the GPS Visualizer link, however, my Oregon 450 does not output a field representing speed so haven't been able to duplicate the webpage example you forwarded. Speed is calculated in Open CPN for each track but the field is not in the exported properties table. Will keep looking.

Edited by - on

Topic

New Topic

Topic Locked

Printer Friendly

Jump To:

Association Forum

Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.