Path: news.eternal-september.org!eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: rbowman Newsgroups: comp.os.linux.misc Subject: Re: FAA To Finally Ditch Floppy Disks & Win-95 Date: 23 Jun 2025 19:11:43 GMT Lines: 22 Message-ID: References: <102k8b7$9k0q$1@dont-email.me> <5bqcncF-gopLr9P1nZ2dnZfqn_idnZ2d@giganews.com> <102mkq6$ul07$2@dont-email.me> <102svmu$2mtm4$2@dont-email.me> <7W6dncD4ub0qu8_1nZ2dnZfqnPadnZ2d@giganews.com> <20250618080351.00007899@gmail.com> <1033kl9$th0$2@dont-email.me> <10362qd$10ote$5@dont-email.me> <8judncOVBsnUxsr1nZ2dnZfqnPSdnZ2d@giganews.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net +WnYKjBDJ8l4DGNG9is13wJe9tljjCjuNEOh4KwFK8l60XNfwU Cancel-Lock: sha1:0cJL3ax1gJi160HKqX4t+B7PT0U= sha256:B2LoWwMz13sWny8wunx58SOAcG21UU4zO7Ab0dwwx/k= User-Agent: Pan/0.160 (Toresk; ) On Mon, 23 Jun 2025 16:43:35 GMT, Charlie Gibbs wrote: > On 2025-06-23, rbowman wrote: > >> Years ago Trimble was a big player when emergency services started >> using AVL and they had their own format. Geocom, another player, sent >> the coordinated in hex. It's been a long time but there was also a >> magic number involved where x and y were the hex values. >> >> *lat = (double) x * 5.729577957 * .0000001; >> *lon = (double) y * 5.729577957 * .0000001; > > That number looks suspiciously like the number of degrees in a radian, > divided by 10. You're right. I was looking at source code I wrote about 20 years ago without giving it much thought. Unfortunately, now I'm thinking. I wonder what the raw GNSS data looks like? There are a lot of GPS modules for microprocessors but afaik they only spit out NMEA sentences. That's no fun.