NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Celestial Calculator Comparisons
From: Richard B. Emerson
Date: 2000 Mar 09, 8:18 AM
From: Richard B. Emerson
Date: 2000 Mar 09, 8:18 AM
Harjit Singh writes: > Can anyone, give me some information on the PC Sightmaster, as compared to > the other calculators? > While I haven't used PC Sightmaster, I'll offer a couple of comments about "other calculators", specifically the Celesticomp V and StarPilot. I own both although I just bought the StarPilot about two weeks ago. The main advantage over these calculators is they don't live on a PC (although StarPilot, through its host TI-86 can make some use of a PC for updates and printing output). Celesticomp uses a programable Sharp calculator with long-life lithium batteries (I haven't had to change mine in over two years) while StarPilot uses a TI-86 which uses AAA alkaline batteries (projected life is about a year) and a lithium backup battery. The basic sight reduction process is common to all three products; the difference is the user interface and added features (e.g., sight planning, set and drift calculations). StarPilot is loaded with options and uses a larger screen to display prompts. Celesticomp fits all prompts into one line and can, on occasion, be a little cryptic (but a little practice smooths over this wrinkle). It doesn't have as many "chrome" features (for example, StarPilot can do lunars and uses its screen to give a rough map of stars). On balance, the added "chrome" can actually impede usefulness (for example, if data is input on one for air temperature and pressure and then forgotten in another day's work, it could be a problem). Documantation for both products is, I think, a triffle thin. While each product has examples demonstrating the calculators' functions, I came away with the feeling that I wasn't quite ready to go to sea based solely on what I'd learned from the manuals. Now, in all fairness, there is the very real issue, for the writers, of drawing the line between "this is how to use this product" and "how to navigate, coincidentally using this product". One demonstration of what I'm referring to is the short dip option. StarPilot can use Short Dip (where the horizon used for a sight is closer than the visual horizon - this is useful when practicing sights on a small bay or lake, for example) and this option is described to some extent (page 19 or section 10.11, for those reading along [g]) but, aside from knowing the option exists, I still don't know where the actual distance to the horizon is entered. Also, there are a few typos (e.g., "Resale" for "Rescale") which seem to plague Starpath products in general. Nevertheless, I think StarPilot, bcause of its connection with Starpath and their navigation training courses, gets a slight nod for its manual. On the question which is easier to learn, I think it's a draw. Celesticomp's inputs are a little easier to get to and check (for example, date, fix time, DR data can be inspected at the start of each sight reduction or skipped over with one key stroke). The prompts are short and based learned by using the calculator in some practice runs. StarPilot, once all the options are understood, can be set up a little more easily because most prompts aren't as brief ("WT" for watch time still bothers me but that's a personal quirk) as the Celesticomp's. Remembering all of the options, however, is a slightly larger chore. On the matter of price, the Celesticomp V (list price is about US$250) is available from a limited number of sources but, with a little effort, can be found at a discount. StarPilot lists for the same price but is sold both with the calculator and on a CD-ROM or via Internet download (along with the documentation which is supplied in PDF format and can be read without a license). I bought a brand new TI-86 on eBay for US$65 (discounted prices vary from about US$100 to US$130). The GraphLink adapter (one time purchase to connect the TI-86 to a PC) sells for US$20 or, in a couple of cases, US$19.95. I ordered it and the software download license ($119) from StarPath. When asked to recommend the Celesticomp or the StarPath to a friend, I said that the Celesticomp is a little less complex and better for the person who says "all I want is to just reduce sights and do my own plotting". StarPilot is for the person who wants the option to use more of the lesser known navigation techniques (e.g., meridian transits, latitude from the altitude of Polaris, or GMT from lunar distances). There is no clear-cut "A is better than B" in this comparision; each product is very good and the decision will have to be made on what fits individual needs. It's easier to fit either (or both! [g]) in my nav bag than it is to fit in my laptop. DISCLAIMER: As stated above, I own the products mentioned but have no other connection with either Celesticomp or Starpath, save as a customer. Rick S/V One With The Wind, Baba 35