Sight Calc

Name: Sight Calc
Rating: 5 (6 reviews)

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Sight Calc

Navigation

6 ratings

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Sandy TREVOR

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User Reviews for Sight Calc

Sight Calc

Easy to use. Calculations are accurate. I've been using it for a month doing Sight Reductions.

Camelot Navigator, Feb 04, 2012

1.2 Works with new iOS 10

Started using this apt last year when taking USPS "JN" to check my Law of Cosigns calculator method with the old ISO and it worked with some bugs. Upgraded to the new IOS 10 and had to workaround to get the answer. New Sight Calc 1.2 update takes care of that workaround using the new IOS 10. Stilling using it in my new class USPS "N" to recheck my LOC calculations...

GaryL230, Mar 30, 2017

Good for USPS Navigation and Jr Navigation Courses.

I used this a lot to get through my Jr Navigation course last year with The United States Power Squadron. It was a tremendous work saver.

jjmmss01, May 25, 2017

Celestial Nav Students

This app is a "must" for quick and accurate solutions to the "law of cosines"ANEO

Maroo Matoo, Jun 17, 2017

Well pleased

As a USPS sight folder reviewer, your app has saved me hours of laborious effort. Thank very much for taking the time to make this job easier. The app works perfectly.

P/N Russ, SN, Jan 05, 2013

Great

User friendly and accurate. Saves a lot of time

Pat1502, Feb 05, 2012

Quick Basic Sight Reduction

You put in the LHA, plus the AP Lat or DR Lat, and the declination, and out pops azimuth, true azimuth, and Hc. Couldn’t be easier to learn and use and is a great time saver.You can also input a meridian angle eastward instead of the LHA by inputting it as a negative LHA. I find that calculating a meridian angle eastward is more intuitive for rising bodies than LHA so this saves me the step of converting it into a LHA. If you understand how celestial works it will also give you great circle initial course and distances just as easily. Just substitue the difference in longitude for the LHA and the Lat of your arrival for dec.I have not yet tried using it to pre-calculate altitudes for planning sights but I’m sure it would be handy for that too. Five stars for simple easy and very useful!

PeterB26, Oct 18, 2018

Sweet App ... But the Azimuth Can Be Wrong

I love this App! It looks like it has been out for a while and had a lot of good reviews. I'm only putting this as a 2-star review at this time to bring attention to the fact that using this App when you are lost at sea may get you lost even further!From my testing the result Hc and Z is spot on! But will the sailors using an app like this know the difference between Z and Zn? If you assume that the result Z value is your azimuth and graph your sight based on that value, you are going to be lost at sea. Another correction is required to determine the azimuth. You have all of the inputs to make this correction, why not provide the azimuth output? As documented in the Ho229 tables:Latitude SAME Name As Declination - N. Lat, LHA < 180 .... Zn (azimuth) = 360-ZLatitude CONTRARY Name to Declination - S. Lat, LHA < 180 .... Zn (azimuth) = 180+ZThe app is very easy to use and does the basic calculations correctly. Please calculate and output the azimuth and I will gladly update this to a 5 star review!

Single Handed, Sep 19, 2016

works well

Simple, straightforward, works well. I use it to check sight reductions done with HO 249; it’s comforting to have an app give the same result as table lookups. Thanks.

skkippy, Dec 29, 2014

Sight Calc-Don't Take JN Without It !!

Slide rules and scientific calculators are not my thing. Many thanks to sight Calc for getting me through the USPS JN course!

TridentMiami, Jun 16, 2017

Description

Sight Calc is a specialized calculator for the that eases the task of calculating sight reductions via the "Law of Cosines" method. It does not use Nautical Almanac data, so you must first compute LHA (Local Hour Angle) and declination, and determine your approximate latitude. It is designed particularly for students learning celestial navigation, such as the Off-Shore Navigation courses taught by the US Power Squadrons®.

If you are unfamiliar with how to do sight reductions, some good resources are available from the U.S. Power Squadrons® at www.usps.org. In particular, this calculator is useful in conjunction with Form SR96a, www.usps.org/eddept/n/files/sr96a.pdf Inputs are always entered as two numbers: Degrees - left display Minutes - right display If you already know the value in decimal degrees (e.g., 44.48833), key it in followed by ENTER, then press ENTER again to indicate zero minutes. Sight Calc will prompt you to enter six number in sequence: LHA (degrees) LHA (minutes) Lat (degrees) Lat (minutes) Dec (degrees) Dec (minutes) After you enter each value, it will be displayed in decimal degrees in the corresponding register. After you enter the last value (Dec minutes), Hc and Z will be computed and displayed. **NEW in version 1.3: enter North Latitude as a positive number, and South Latitude as a NEGATIVE number. Sight Calc will take the absolute value of Latitude in the law of cosines formula, but needs the hemisphere to calculate Zn. The sign of Declination is positive if Latitude and Declination are the same sense (both North or both South). If they are different, key the minus sign before the first declination digit. If you want to do repeated calculations with some of the same numbers, just enter the changed numbers and press ENTER to accept the remembered values from the previous sight reduction. To start over fresh at any time, press "C" to clear everything. CE clears just the Current Entry. Please report any bugs or suggestions to: [email protected]