X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 17 Mar 2011 12:05:52 -0400 Message-ID: X-Original-Return-Path: Received: from smtp0.av-mx.com ([137.118.16.56] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4909240 for lml@lancaironline.net; Wed, 16 Mar 2011 22:51:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.56; envelope-from=pinetownd@volcano.net Received: from DennisPC (unknown [65.170.221.93]) (Authenticated sender: pinetownd@volcano.net) by smtp0.av-mx.com (Postfix) with ESMTP id 10DE81C0278 for ; Wed, 16 Mar 2011 22:51:19 -0400 (EDT) X-Original-Message-ID: <1710B62B94DF48D0A14800BF316AEF71@DennisPC> From: "Dennis Johnson" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Re: [LML] Chelton updates X-Original-Date: Wed, 16 Mar 2011 19:51:18 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_05B8_01CBE413.849044F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18263 This is a multi-part message in MIME format. ------=_NextPart_000_05B8_01CBE413.849044F0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Duane, I'm sure you know this, but just in case, I should clarify that the = Chelton systems have three separate databases: 1. Navigation data, such as airport info and instrument approaches. 2. Obstacle data, such as towers and antennas. 3. Terrain data, such as mountains and valleys. It does not include = obstacles like towers or buildings. Most Chelton users I know regularly update the navigation and obstacle = databases only, which come out every 28 days. Since basic terrain = doesn't change much, unless you're flying very close to Mt. St. Helens, = even an old terrain database is probably adequate, since the earth = doesn't move that much in a decade or two. Since the terrain database = is too large to fit on a memory card, I'm still flying with the original = one that came with my Cheltons over five years ago. Dennis Legacy, approaching 400 hours tach time=20 ------=_NextPart_000_05B8_01CBE413.849044F0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF

Hi Duane,

I'm sure you know this, but just in case, I should clarify that the = Chelton=20 systems have three separate databases:

1. Navigation data, such as airport info and instrument=20 approaches.

2. Obstacle data, such as towers and antennas.

3. Terrain data, such as mountains and valleys. It does = not=20 include obstacles like towers or buildings.

Most Chelton users I know regularly update the navigation and = obstacle=20 databases only, which come out every 28 days. Since basic terrain = doesn't=20 change much, unless you're flying very close to Mt. St. Helens, even an = old=20 terrain database is probably adequate, since the earth doesn't move that = much in=20 a decade or two. Since the terrain database is too large to = fit on a=20 memory card, I'm still flying with the original one that came with my = Cheltons=20 over five years ago.

Dennis

Legacy, approaching 400 hours tach time

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