Mailport & PS Advisor

Vanderbilt University is offering a free online course in celestial navigation fundamentals. The course-developed in collaboration with PS Technical Editor Ralph Naranjo, made possible by the Blended & Online Learning Design (BOLD) Fellows Program, and hosted by Vanderbilt-covers the basics for completing a sight reduction form to obtain a line of position (LOP). Using videos and an online worksheet, the course includes an overview of celestial navigation (astronav) concepts, the mechanics of plotting an LOP, and examples of using a sight reduction forms to obtain values to plot the LOP of a celestial body. According to Vanderbilt, this course serves to address the lack of widely available instruction in celestial navigation.

We recently purchased a Webasto Airtop 3900 do-it-yourself (DIY) kit from Defender Industries. The instructions were very comprehensive, and the installation and product work exactly as they should, which typically would lead me to recommend this as a great DIY product. The issue, however, came when we tried to register the product for warranty.

Weve noticed an odor and a buildup of caked-on solids in the holding tank. My thought is to fill the holding tank with fresh water and the right additive, then let that slosh around underway, and then pump it out. What do you suggest for an additive?

I have taken courses (most recently with Jeff Isaac, organized by Ocean Navigator) on offshore emergency medical issues, and there are many who believe that suturing on board is generally not wise. Its much better to butterfly bandage or some other less zip-locked method of repair. The thinking appears to be that it is impossible to have a sterile environment on a vessel, so the bad stuff is likely to get locked into the wound, where it will cause infection. So, its much better to have a more open repair.

Reader Fred Jensen and his wife, Barbara, of Sandusky, Ohio, pointed out an error in our illustration in the August 2015 issue of Practical Sailor. The photo-illustration depicted a bow-roller and headstay, and lines indicated wire stays with turnbuckles that were required to counter the headstay loads when the boat is under sail. It was the published answer to a puzzle that rigger Brion Toss posted in the May 2015 issue of Practical Sailor in his photo-essay The Hidden Causes of Rig Failure. The corrected illustration appears at right.

On the recommendation of Practical Sailors water filter test (see PS June 2015), I bought a two pack of Camcos RV Taste Pure water filters through Amazon after finding sediment in my water tank. One of the filters dumped 1/8-cup of the carbon/KDF granuals all over when I took the protective cover off the filter, and it continued to shed the media when I shook the filter. If I had connected the filter to my water supply, it would have contaminated my water system and probably ruined my water pump. Only one of the two filters is dumping carbon/KDF material, so I assumed that this is a product defect.

The used boat review of the Tartan 37 in the January 2015 issue mentioned that several companies specialize in producing bullet-proof companionway door arrangements that can be customized to fit almost any boat. I would like the names of such companies in the U.S. as I am looking for ways to improve my boats current companionway arrangement.

The article Dissecting the Art of Staying Upright (see PS June 2015 online) was very timely for me, but I am struggling with how to apply it to real life and specific boats. How do I find information on the angle of vanishing stability for specific boats? Can you point me to other articles like yours where I can learn more?

In regard to your July 2015 article, Keeping Water Clean and Fresh: We have well water at our dock, and the water tanks in our boat are integral to the hull. How does this impact the process for cleaning and sanitizing?

After three separate three-month cruises-on a Niagara 35 in the Great Lakes and a Gulfstar 36 in Florida-we have found no problems with the EVO-1 autopilot by Raymarine that we first reported on in PS, September 2014. Although we experienced no gale or storm conditions (were cautious in our old age), we did get plenty of practice in heavy winds (15 to 25 knots) and light winds (12 down to drifting), and a great deal of motoring. In all conditions, the autopilot steered the boat exactly to our requirements.