Return-Path: Received: from mtain-dj02.r1000.mx.aol.com (mtain-dj02.r1000.mail.aol.com [172.19.187.138]) by air-db10.mail.aol.com (v128.1) with ESMTP id MAILINDB102-86244bb6ccb8307; Sat, 03 Apr 2010 01:06:00 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dj02.r1000.mx.aol.com (Internet Inbound) with ESMTP id F1FE93800008B; Sat, 3 Apr 2010 01:05:58 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NxvX2-0004k3-Du for rs_out_1@blacksheep.org; Sat, 03 Apr 2010 06:04:28 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NxvX2-0004ju-1y for rsgb_lf_group@blacksheep.org; Sat, 03 Apr 2010 06:04:28 +0100 Received: from mailfilter4.ihug.co.nz ([203.109.136.4]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NxvWz-0001Mp-QB for rsgb_lf_group@blacksheep.org; Sat, 03 Apr 2010 06:04:28 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AmIKAB5ptkvLbdzL/2dsb2JhbACHVod9i3dyswuFBgSLKQ X-IronPort-AV: E=Sophos;i="4.51,356,1267354800"; d="scan'208";a="255828278" Received: from 203-109-220-203.dsl.dyn.ihug.co.nz (HELO athlon1200) ([203.109.220.203]) by cust.filter4.content.vf.net.nz with SMTP; 03 Apr 2010 18:04:18 +1300 Message-ID: <02d501cad2eb$37076720$7900a8c0@athlon1200> From: "Dave Brown" To: References: Date: Sat, 3 Apr 2010 18:05:00 +1300 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: Motorola GPS Time Oddity Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039cdbc9d064bb6ccb67292 X-AOL-IP: 193.82.116.20 Andy What happens if you talk to in in binary? Same results? NMEA seems to often be almost an afterthought in some receivers and often odd things happen when using it... DaveB, NZ ----- Original Message ----- From: "Andy Talbot" To: ; ; Sent: Saturday, April 03, 2010 5:13 AM Subject: LF: Motorola GPS Time Oddity > I've noticed a curious odditity on a Motorola M12 GPS module, when > started > up completely from cold with no stored almanac data: When the > module eventually 'appears' to lock up and show the correct lat > /long and > the NMEA data showing satellite staus 'Valid', the NMEA reported > time is 15 > (ish) seconds out. Which means it hasn't downloaded the > leap-second > correction yet and is still working on GPS time - the NMEA report > gets > corrected after a minute or two longer wait. > > BUT... Why does it decide that it has enough info for location > calculation > when it clearly hasn't yet downloaded all the almanac data ? > It's lying. Has anyone met this? > Only the M12 behaves like this out of those tested. All other > modules I've > used, including the older Motorola. Oncore,. give the correct time > immediately they show lock. Of course, if the internal battery is > alive > the almanac data is already stored and it jumps into life > immediately with a > warm start, but after several months of storage - sometimes just > weeks - > this battery goes flat. > > Andy > www.g4jnt.com >