Class B installs #1, Brookhouse solution

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.

5 Responses

  1. richardstephens says:

    Shipmodule’s Miniplex also does this. He calls it “Priority” mode.

  2. Ben Ellison Ben Ellison says:

    Some valuable comment from an expert:
    Note, both AIS Class A and Class B have internal GPS units by design (i.e. per IEC standards). However, currently only the Class B internal GPS must meet IEC 61108 standards for positioning (i.e. accuracy, integrity, reliability, etc.); current Class A’s weren’t designed to meet 61108—the thought being, since they rely upon the ship’s external electronic positioning fixing system for lat/long, COG, and SOG there was not a need to add this additional expense to the unit.
    This is a novel product…it’s a shame that they didn’t design it to use the ‘best available’ position rather than arbitrarily assigning the AIS GPS as a back-up. Few if any, recreational GPS’s meet the stringent IEC standards, nor can they be differentially corrected via an AIS message—as both AIS Class A and B’s can. So in most likelihood the AIS GPS will outperform other GPS’s.

  3. ibsailn says:

    I installed a Brookhouse AIS-MUX last winter and have been very happy with it.
    The scripting language that Brookhouse uses is very flexible so there is no reason that you can’t make your AIS your primary with your seatalk or other GPS’s as multiple backups. I don’t think there is any way to use the HDPE value to select a GPS source, but I remember a previous conversation here that led me to believe that the HDPE value isn’t very meaningful when comparing different makes of GPS as it is easily manipulated by the GPS maker. My setup which I promise I will detail some time this fall for Ben if he wants it or at least my blog (see link below) uses the Seatalk GPS as primary, with a secondary nmea backup (should seatalk network go down) as well as a third backup in the form of a cable to a handheld GPS.

  4. I installed the Actisense NDC-4 multiplexer a few months ago. It has a similar capability. Very nice product.

Join the conversation

Your email address will not be published.