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Showing results 1 to 14 of 14
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Search: Posts Made By: timtwickham
Forum: Seamanship & Navigation 07-04-2014
Replies: 5
Views: 340
Posted By timtwickham
Re: Multiple formats for sonar logs

Everyone who chooses to use a Navionics based chart plotter or their app, and the chart plotter is recent enough to support the Navionics user data, and they subscribe to Navionics+ or Freshest Data,...
Forum: Seamanship & Navigation 07-02-2014
Replies: 0
Views: 258
Posted By timtwickham
Help create better charts

TeamSurv, the crowd sourced community charting project, is recruiting more boats to participate.
Whilst we'll welcome you wherever you are, at the moment we are particularly interested in the...
Forum: Seamanship & Navigation 07-02-2014
Replies: 5
Views: 340
Posted By timtwickham
Re: Multiple formats for sonar logs

Navionics is different - it is a closed system so you are just proiding data for Navionics to use updating their charts. With TeamSurv (of which I am a part) we make the data available to all.
Tim
Forum: General Discussion (sailing related) 02-21-2014
Replies: 0
Views: 142
Posted By timtwickham
TeamSurv project featured by the BBC

The BBC recently ran a piece on TeamSurv, the crowd sourced surveying project. You can see it online here: www.bbc.co.uk/news/technology-26231350 (http://www.bbc.co.uk/news/technology-26231350)
...
Forum: General Discussion (sailing related) 06-25-2010
Replies: 0
Views: 448
Posted By timtwickham
Help create better charts

TeamSurv is a project to help create better charts of coastal waters, by getting sailors to log GPS and depth data - see TeamSurv - Home (http://www.teamsurv.eu) for more information. For example, in...
Forum: General Discussion (sailing related) 04-03-2010
Replies: 45
Views: 2,932
Posted By timtwickham
Glonass, Galileo and the other GNSS systems have...

Glonass, Galileo and the other GNSS systems have the same vulnerabilities as GPS - the same weak signals, and operating in the same frequency band. Jam one, and you'll probably jam them all.
...
Forum: Seamanship & Navigation 04-03-2010
Replies: 21
Views: 6,634
Posted By timtwickham
You could have a look at software to give you the...

You could have a look at software to give you the almanac and do the sight reduction calculations - see WinAstro Celestial Navigation Software - Home Page (http://www.winastro.com) for example.
Forum: General Discussion (sailing related) 03-10-2010
Replies: 45
Views: 2,932
Posted By timtwickham
GPS is very easily jammed, and you can buy...

GPS is very easily jammed, and you can buy jammers over the web. Quite apart from the risk of people retaliating at their countries being invaded, New York cabbies use them to jam the GPS in their...
Forum: Electronics 03-10-2010
Replies: 19
Views: 1,748
Posted By timtwickham
If you want to go NMEA2000, several manufacturers...

If you want to go NMEA2000, several manufacturers make NMEA2000/0183 bridges (Maretron, Actisense, Simrad, Furuno), but be aware that all of these rely on internal software to map between the two...
Forum: General Discussion (sailing related) 02-01-2010
Replies: 24
Views: 3,637
Posted By timtwickham
For books, have a look at winastro.co.uk....

For books, have a look at winastro.co.uk. Although the site is mostly about sextant software, it also reviews the most popular books on the subject.
Tim
Forum: Seamanship & Navigation 01-21-2010
Replies: 8
Views: 966
Posted By timtwickham
Unfortunately you won't get NAVTEX in Australia...

Unfortunately you won't get NAVTEX in Australia and New Zealand - see the coverage map at PC Navtex - NAVTEX Coverage Chart...
Forum: General Discussion (sailing related) 01-21-2010
Replies: 24
Views: 3,637
Posted By timtwickham
There's a review of various celestial navigation...

There's a review of various celestial navigation books etc at WinAstro's Recommended Books on Astro Navigation (http://www.winastro.co.uk/winastrobooks.html)
Tim
Forum: General Discussion (sailing related) 01-21-2010
Replies: 11
Views: 1,328
Posted By timtwickham
As other have said, the GPS and chart datums are...

As other have said, the GPS and chart datums are probably incorrect.
The good news is that for charts of the scale you use for navigation, the poition offset can be assumed to be fixed. So measure...
Forum: Electronics 01-21-2010
Replies: 19
Views: 1,748
Posted By timtwickham
You can get NMEA0183 going over NMEA2000 using...

You can get NMEA0183 going over NMEA2000 using one of the bridges from the likes of Maretron or Actisense, but unless there is a specific need to do this I would suggest having two seperate data...
Showing results 1 to 14 of 14

 

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