Wednesday, April 5, 2017

Converting a Google Earth Path to a GPX Route

There are occasions in navigation when we might want to make a route starting with Google Earth (GE).  This can occur when there is poor charting of an area, but good satellite images, or in more common cases of just wanting to take advantage of the slick display GE offers to layout a route, and then do the fine tuning relative to charted aids on an actual chart.

When doing the latter, one thing we learned to be aware of is GE images do not specify tide height!  We have made a few practice routes in and around small islands, only to learn after the routes were imported to a navigation program and viewed on real charts, that in fact the tide was high when the image was taken, so we were actually laying out a route over a foreshore.  Looked like perfectly good water in the satellite image.

The procedure described here is making and saving a path using GE, and then applying a simple conversion to put this into standard GPS Exchange format (GPX), which is a file type that all navigation programs can read and interpret.

We have discussed this in earlier posts, listed below, but our new system is better documented and now employs a conversion service of our own that is as direct as possible.  The process is described in this video:

The converter is located at this page

Starpath KML to GPX converter (, 

which repeats the instructions.


Earlier related notes include:

Route Planning and Sharing with GPX Files

How to make current stations into waypoints in a batch process

The GPX standard is described here: GPX 1.1 Schema Documentation

An online service that does several types of conversions is GPS Visualizer

Here are what these files look like.  They are xml format. They are readable in a text viewer.

A KML file:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="" xmlns:gx="" xmlns:kml="" xmlns:atom="">
<StyleMap id="inline">
<Style id="inline0">
<Style id="inline1">
-109.9149585549397,24.54030130162237,0 -109.7004369370675,24.16846017059697,0 -109.7511069786428,24.1101387791539,0 -109.8286141711317,24.09290849128375,0 -109.9329035588094,24.10824725446978,0 -110.0257611588921,24.29775334743895,0 -110.2115066128303,24.58804334869875,0 -110.3484830291369,24.66860558615499,0 -110.4831806473397,24.63053918262128,0 -110.4894445378171,24.48650911115754,0 -110.4181686154688,24.36026101756055,0 -110.3474312753582,24.36824754053653,0 -110.2411283328199,24.41132537504683,0

and a GPX file after conversion to GPX:

<?xml version="1.0"?>
<gpx xmlns="" xmlns:xsd="" xmlns:xsi="" xsi:schemaLocation="" version="1.1" creator="Starpath School of Navigation -">
<rtept lat="24.54030130162237" lon="-109.9149585549397">
        <rtept lat="24.16846017059697" lon="-109.7004369370675">
        <rtept lat="24.1101387791539" lon="-109.7511069786428">
        <rtept lat="24.09290849128375" lon="-109.8286141711317">
        <rtept lat="24.10824725446978" lon="-109.9329035588094">
        <rtept lat="24.29775334743895" lon="-110.0257611588921">
        <rtept lat="24.58804334869875" lon="-110.2115066128303">
        <rtept lat="24.66860558615499" lon="-110.3484830291369">
        <rtept lat="24.63053918262128" lon="-110.4831806473397">
        <rtept lat="24.48650911115754" lon="-110.4894445378171">
        <rtept lat="24.36026101756055" lon="-110.4181686154688">
        <rtept lat="24.36824754053653" lon="-110.3474312753582">
        <rtept lat="24.41132537504683" lon="-110.2411283328199">

Wednesday, March 15, 2017

Adobe Digital Editions (ADE) User's Guide

1. What is Adobe Digital Editions?

There are several ebook formats on the  market. Kindle is the most popular and iBooks is likely next. Both have well designed systems, which means: easy ebook purchases, distribution, and reader apps with many functions.  Unfortunately, each is highly restricted by their owners (Amazon and Apple, respectively), leaving little flexibility for distribution and use in a physical or online classroom setting, as we need in our training program at Starpath. Kindle is multi-platform (PC, Mac, dedicated readers, iOS, and Android); iBooks are restricted to Mac and iOS (i.e., iPhones and iPads).

There is, however, an attractive, all-platform option offered by Adobe. It is called Adobe Digital Editions (ADE). In this system, Adobe provides the ebook reader app (ADE), and it provides the digital rights management of the documents, but it leaves the sales and distribution of the content to associated partners. It also allows third parties to develop dedicated ebook readers for ADE books, but that is not the subject at hand. For now we are concentrating on the use of the ADE app for reading the ebooks in computers (Mac or PC), as well as tablets and phones (iOS or Android).

With ADE, you can read ebooks in several formats, but the most popular are epub and pdf.  For our books, and most for that matter, the epub format is the best choice when available. It is the same format used in Kindle and iBooks. It has flowing text, and lets the user select the text size, and other formatting. You can place bookmarks, highlight text, and add notes to any part of a page.  You can also search for key words and links within the document can open external webpages or go to specific parts of the book from links within the text. A reference in the text to Figure 1.3, for example, would be an active link to that figure.

You can also view and store free ebooks or pdfs in the ADE reader. This is a good way to compile and organize, for example, manuals to engine or electronics components, or store navigation texts that you download from the USCG, such as the Navigation Rules, Light List, Coast Pilot, and Chart No. 1.

The video below shows the reader in action.

[video 1 ADE Reader in a Mac]
This video will be added shortly. ADE is the only reader option for Adobe ebooks viewed on a Mac, but for mobile devices (iOS and Android) the Bluefire reader offers more functions.

2. How to Download, Install, and Authorize ADE.

Below are the instructions, followed by a short video demo.  You can download the ADE app to any device from the link:

Save it to your downloads, then execute the installer.  During the PC install process, watch the steps. You might want to uncheck the Norton Securities trial period they offer. It is better to get this on your own from Norton if you want this.  It  has nothing to do with the ADE reader.  This does not show up on the Mac install.

The next step is to authorize your device with an Adobe ID. If you do not already have an Adobe ID, then you first need to get one. This is a fast, and non-invasive process. They are easy to get, but it is best to use only one Adobe ID for all of your ADE books. So once you get one, be sure to archive safely the email address you used to get the ID... and the password, but you can always get the password back if you know the email you used.

The reason it is best to use only one Adobe ID for your ebooks is because once you open a purchased ebook with a device authorized to a specific Adobe ID, then that book can only be opened on devices using that same authorization. Over the years and over the books, it can get confusing if you have more than one Adobe ID. With just one ID, it is easy to move your books around to other devices without any issue.  This situation is not unique to Adobe.  It is just the same with Kindle or iBooks. The only difference is Adobe IDs are very easy to get, whereas an Amazon account or iCloud ID is more involved with credit cards and so on, so we more naturally do not often have multiple accounts.

To get an Adobe ID, go to  and on the top right there is a sign-in link, click that, then under the sign-in form there is a "Get Adobe ID" link. Click that to see what they ask below. That is all. Remember your email address (that is the Adobe ID) and the password you selected.

Then we return to the ADE app on your computer or device to authorize it.

At the far right of the Adobe Digital Editions menu at the top of your computer screen on a Mac, or at the top of the app window on a PC, there is a Help menu. Click that to see the authorization options.

On a mobile device, find the authorization information from the table of contents icon (3 horizontal bars) under Settings.

On computers you see:

        Erase Authorization, and
        Authorization information.

If you computer is already authorized, you see just the last two. This information is presented slightly differently in the mobile ADE apps, but the same options are there.

Choose Authorize Computer from the menu, then in the authorization window leave the option "ebook Vendor" set to Adobe ID, and enter your Adobe ID email and the password below.

Leave the box unchecked that says "I want to authorize my computer without an ID."

Then click the Authorize button, and you are done.

Videos below show this process in a computer and in an iPhone.

[video 2, set up in mac]   [video 3 setup in iPhone ]

3. How to Buy and Download Starpath Adobe eBooks

Starpath Adobe ebooks are sold, distributed, and archived for you by the Qbend Corporation, who have set up an ebook store that you can reach at: 

The store has the books grouped by subject matter, with a standard shopping cart and check out procedure. Bankcard processing is carried out by PayPal, but you do not need a PayPal account to use it.

To purchase books, the first step is to set up a Qbend account.  Again, this step is fast and completely non-invasive. No credit card information is needed to set up an account. The input form is shown below.

The Qbend ID is just for purchasing ebooks and accessing them for download. Your ebooks are also saved here if you need a copy for another device later on—although there are other ways to move books amongst devices.  You could use the same ID for Qbend as for you use for Adobe or choose a completely different one. This Qbend ID has no relationship at all to your Adobe ID. The email address you use here will be the ID you use to log into the Starpath ebook store—or any of the many other ebook stores they host.

Note that the Qbend site does not work if you have pop-up blocking turned on. If you click something and noting seems to occur, check the top of your browser screen to look for a blocked pop up notice, and choose to accept popups from this site.  This unblocks them for this site only, it does not otherwise turn off your blocker.

Once you have selected and purchased a book, applying discount coupons you might have, the book is moved to your Download Basket—a link on the left that shows up once you have logged in.

Selecting the ebook format
Most Starpath ebooks offer two format options, epub and pdf. We strongly recommend the epub format for most users. The flowing text epub format can be viewed on any device, and it has much flexibility in display and generally responds better on most platforms than the large graphic pages of the pdf format. The pdf option reproduces the exact page layout of the original printed books, but these are fixed in size, and for smaller screens require panning and zooming to read the pages. On the other hand, if you are only viewing the books on a large computer screen, then the pdfs could be a viable option. The epubs can be easily read on mobile devices and computers, but the pdfs do not work well on small screens.

To download the book to your computer or device, go to My Download Basket and click the download button.  This process does not download the full book, but rather just a very small file with the name "booktitle.acsm."  The download process will put this file wherever you tell it to go, with a default to your downloads folder.  This small file is essentially a proof of purchase that you will then open in the ADE reader—or other readers, as we explain later. The extension ".acsm" stands for "adobe content server message." It is a fulfillment token that identifies the book, where it came from, and your unique purchase.

At this stage, the ACSM file is unclaimed property. That ACSM file could be opened by any Adobe ID that has the file, but once an Adobe ID opens the file, then that same ACSM file will only work in ebook readers authorized to the first Adobe ID that opened it. The ACSM file is still a signature of the book, but it is now claimed by the Adobe ID that opened it first.

To convert the ACSM file into an ebook, be sure you have ADE installed and authorized, then just double-click the file and it will open ADE start to download the full book. Once that is done, it is in your ADE library for further reading.

Alternatively, you can use the menu option File/Add to Library, then select file type ACSM, navigate to where the ACSM file is stored, and select it.  Once that is done, by either method, you just need to open ADE to see the book in your library.

A video example

4. How to Move Adobe  eBooks to Other Devices

One way to load an adobe ebook to another computer is to use the browser of  the second computer to go to the ebook store and just download the file to the new computer, which already has ADE installed and authorized as above, then follow through as described. This process, like the initial download, is easiest if you install and authorize ADE ahead of time.

This procedure, however, does not work well on all Android devices and does not work at all on iOS devices.

An alternative method is much easier. Namely, go the ACSM file you downloaded as in Part 3 above, and just email the file to yourself as an attachment, and then check your mail in any other device or computer you want the book loaded to.  It is important, however, to first install and authorize ADE in the new devices or computers as outlined above.

When you get the email and click the attachment, it will ask how you want to open it, and ADE will be an option. Choose that and you are done.  Since it is common to be able to open your email in any device, one email to yourself distributes the book to all of your devices in one step.

In principle, Adobe has a limit of the number of devices that can be authorized to the same Adobe ID, and this limit is about 6. But you can, if you need more, erase the authorization from some of them if not needed, or in the extreme case you can send an email to Adobe and explain why you need more.

Historically, Adobe did not have the "erase authorization" option, so every authorization of a book counted as one of the six, even if you had an old device you threw out, but I believe that is different now. I have not run across any such limitations these days, and I use a lot of devices. There is definitely some limit in effect, but it is not clear how it works. They do answer questions about this if needed.

Video example using BlueFire Reader on an iPhone

[ In a later article we will show that although ADE is the only way to view Adobe ebooks in a Mac computer, once you wish to use other platforms, such as iOS or Android devices,  or a PC computer, then there are other free reader options to be considered that compete with the ADE. It is easy to load the books into alternative readers to test this for yourself. ]