Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: rbowman Newsgroups: comp.os.linux.misc,alt.comp.os.windows-11 Subject: Re: GPS Based Speedometers Date: 9 Dec 2025 20:46:44 GMT Lines: 25 Message-ID: References: <106mke5$1di32$1@dont-email.me> <8F_WQ.75605$TwW8.61488@fx13.iad> <10gislv$sv5d$1@dont-email.me> <10gjk9c$158ec$1@dont-email.me> <10gjtk2$18glc$1@dont-email.me> <10gjueh$1934g$3@dont-email.me> <10gmhif$273r2$8@dont-email.me> <10gp6kv$37llv$7@dont-email.me> <10guib0$1ai5r$1@dont-email.me> <10h15ek$2cgcb$1@dont-email.me> <10h6jb8$5cd2$1@dont-email.me> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net hHhYoqPiNgbc56BPpFlJtwXYvv6kBFMFn4tQnZMFbW8ZUoHKrl Cancel-Lock: sha1:OZmYmf6iFQTH65f/ohnUWnvItFQ= sha256:qL+9tCbKBfeHup1/cAnYZNekYx2NHNQgx3CyX4XdheA= User-Agent: Pan/0.162 (Pokrosvk) Xref: csiph.com comp.os.linux.misc:78592 alt.comp.os.windows-11:28115 On Tue, 9 Dec 2025 12:47:31 -0000 (UTC), Lars Poulsen wrote: > This sounds similar to the marine speedometer I was looking into for a > client. Delivers a stream of standardized ASCII output called NMEA data. > > https://www.gpsworld.com/what-exactly-is-gps-nmea-data/ > https://receiverhelp.trimble.com/alloy-gnss/en-us/ NMEA-0183messages_MessageOverview.html > > Our client was a speedboat racing team. I'm surprised a Trimble unit uses NMEA and not TAIP. https://xdevs.com/doc/Trimble/sveight/sv8_app_c.pdf Almost all police and emergency vehicles are equipped with GPS receivers and send streams of data for AVL (automatic vehicle locator) display on a map. 25 years ago that was relatively rare and most of the units were expensive Trimble units that used TAIP. Looking at the code it now handles 8 different formats including NMEA and a couple of proprietary packed binary message streams. So much for standardized. No hanging around the doughnut shop for the cops anymore. They were radio- collared before the general public.