Printing Your Own Charts While on Board

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I am a novice sailor, but after taking a few more courses, I plan to buy a 30- to 50-sailboat with a few other aficionados. Two questions:

Do modern GPS units for use at sea have capability to attach to a printer or plotter so as to have a paper chart of the region in addition to the digital display on the GPS itself? Is it possible with a handheld GPS-plotter?

Richard Fritze

via email

We got a number of various responses to your query:

From Ralph Naranjo, PS technical editor: Printing your own paper charts is fine if the goal is to use the faux chart as a casual reference or for place mats, but it may not be reliable for position plotting. Commercial paper chart providers use specially indexed, large format printers to make exacting 1 to 1 replicas of raster (RNC) digital files. Print-your-own advocates use open-source software to convert NOAAs free charts (RNC) to PNG or TIFF files. Some use Photoshop in the conversion process. One of the problems is that few sailors have a printer capable of 36-inch x 60-inch prints. If you scale down the paper size it magnifies chart errors. It is also easy to induce dimensional flaws in the latitude-longitude grid.

So if all you want is a reference for eyeballing a jetty entrance, a self-printed small section of a chart derived from a PNG saved graphic may be fine, but if youre in zero visibility fog and plotting a course to the Morse code Alpha buoy, a small error can cause big problems.

From James McGowan, Raymarine: Im not aware of any GPS display, MFD or chartplotter that has the ability to print its digital charts.

However, some of the PC-based navigation systems do have the ability to print charts, or chart sections. Fugawi navigation software is one. Its very likely that Nobeltec and others can do it too.

From Carly Hysell at Garmin: The short answer to your question is no, but there are options. The Garmin Glo GPS can connect to a laptop and overlay your position on top of electronic versions of charts. And NOAA offers electronic versions of paper charts for free.

From Ken Cirillo of chartmaker Jeppesen: As it pertains to charting systems, if we exclude PCs running navigation software, existing chartplotters or multi -function displays (MFDs)) do not have any external printing capabilities.

There are a few ways that users can print out the digital charts they use, but it requires a few steps. Most MFDs have the capability to do screen captures which can be saved to an SD card, which you can use to transfer the charts to a PC for printing.

Most OEMs also have planning software (Navico Insight Planner, Raymarine, Raytech Voyage Planner; Garmin Homeport, etc.). These allow you to create routes, set waypoints, etc. Using your chart card inserted into the SD slot (or via an external reader) on your computer, you can use the makers software to print the chart screen.

Undaunted, we found Posterazor, a free app available at posterazor.sourceforge.net/, which allowed us to print out 1:1 copies of free NOAA charts. The app lets you divide the chart into smaller sheets that can be taped together or put in a booklet. It is not available in iTunes store, so you will get a warning. We ignored it and our computers are still working perfecw&5%e . . . perfectly.

Practical Sailor has been independently testing and reporting on marine products for serious sailors for more than 45 years. Supported entirely by subscribers, Practical Sailor accepts no advertising or any form of compensation from manufacturers whose products we test. Testing is carried out by a team of experts from a wide range of fields including marine electronics, marine safety, marine surveying, sailboat rigging, sailmaking, engineering, ocean sailing, sailboat racing, and sailboat construction and design. This diversity of expertise allows us to carry out in-depth, objective evaluation of virtually every product available to serious sailors. Practical Sailor is edited by Darrell Nicholson, a long-time liveaboard sailor and trans-Pacific cruiser with more than three decades of experience as a marine writer, photographer, boat captain, and product tester. Before taking on the editor’s position at Practical Sailor, Darrell was the editor of Offshore magazine, a boating-lifestyle magazine serving the New England area. Darrell has won multiple awards from Boating Writer’s International, including the Monk Farnham award for editorial excellence. He holds a U.S. Coast Guard 100-ton Master license and has worked as a harbor pilot and skippered a variety of commercial charter boats.

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