Getting ready for Class B, does your AIS plotter do DR?

Ben Ellison

Ben Ellison

Panbo editor, publisher & chief bottlewasher from 4/2005 until 8/2018, and now pleased to have Ben Stein as a very able publisher, webmaster, and editing colleague. Please don't regard him as an "expert"; he's getting quite old and thinks that "fadiddling fumble-putz" is a more accurate description.

3 Responses

  1. Ben Ellison Ben Ellison says:

    Is anyone else having trouble getting into Comments using your TypeKey ID? If so please e-mail me using the Contact link on right side of main page. Thanks.

  2. Duncan says:

    Let’s see… Does this work?

  3. bobetter says:

    I think MacENC/GPSNavX already do this.These apps plot a velocity vector generated from received AIS transmissions-it is a line drawn from an AIS equipped vessel’s reported position out to where it will be in X minutes, X being set in preferences. I could see somehow graphically altering said line over it’s length to illustrate it’s degrading accuracy over time, an essential modification of the DR concept to make it fit in with an otherwise real-time screen (well, almost real-time..). This is only a psuedo DR, but it would indicate graphically that the projected course/position’s confidence level decreases as we move thru the 30 seconds between transmissions. Now, I think an equally important question is how the existing Class A equipment out there will deal with this “30 second blind spot”!

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