[LEAPSECS] Crunching Bulletin B numbers (POSIX time)

[Richard B. Langley]

For those who might not be aware. Loran-C in North America is dead. It  
might be resurrected as eLoran or some other LF service in the future:
http://www.ursanav.com/sites/default/themes/danland/images/buzz/pdfs/LF-Solutions-for-APNT-ION2011.pdf

-- Richard

Quoting Ian Batten <igb at batten.eu.org>:


>>

>> Nope.  tried that when getting the spec approved.  Approximate  

>> times weren't allowed.  UTC times were required.  There was no way  

>> to indicate approximate time in the user interfaces present (how do  

>> you blink a 5071A anyway :).  The other systems that interfaced to  

>> ours had a fixed format, and required UTC and not approximate UTC  

>> for a while and then a possible jump in time to actual UTC.

>

> Well, if the use-case is navigation (Loran, military) then UTC sans  

> leap seconds isn't much use to you anyway, so the "solution" of  

> dropping them would take your requirement with it, and you'd seen  

> something closer to UT1.  And of course, requirements are simply  

> line items on an invoice, and if deriving immediate UTC costs 10X  

> rather than X, the customer has to make a decision on whether  

> they're prepared to pay for it.  Just saying "my customer demands X  

> and therefore the rest of you need to enable X" isn't realistic.

>

> ian

>

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| Richard B. Langley                            E-mail: lang at unb.ca         |

| Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/ |

| Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |

| University of New Brunswick                   Fax:      +1 506 453-4943   |

| Fredericton, N.B., Canada  E3B 5A3                                        |

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