The Breitling Watch Source Forums

I've just joined and am in search of a little information.
I need an explanation for the numbers on the chapter ring (35..50..75 etc.).
I believe they have something to do with instrument and visual flight rules - altitudes where one must fly.
Question is, why on a dive watch.
There's a NEW PLUTON on eBay, and the seller suggested I try here.

Thanks for any info, and hope you were successful selling yours.

Erik

Split into a new topic as it's not related to a 9 month old sales post.

I'll let the pilots provide more details because frankly I don't understand them, but the chapter ring markings are designed to assist with flight level calculations.

Welcome to BreitlingSource.

Correct. From Wikipedia...

"In the US, there are specific VFR cruising altitudes, based on the aircraft's heading, to assist pilots in separating their aircraft while operating under visual flight above 3,000 ft but below 18,000 ft Mean Sea Level (MSL). Unofficially, most pilots use these rules at all levels of cruise flight. FAR 91.159[3] states that any aircraft:

On a magnetic course of 0-179 degrees shall fly at an odd thousand ft MSL altitude +500 feet (e.g. 3,500, 5,500, or 7,500 ft); or

On a magnetic course of 180-359 degrees shall fly at an even thousand ft MSL altitude +500 feet (e.g. 4,500, 6,500, or 8,500 ft)."

IFR rules are more complex and account for the even numbers. Google "Quadrantal rule" for more info.

The Pluton was originally part of the Navitimer range and was considered a pilot's watch.

Altro's excellent write up of the Pluton and its successors can be found on WUS
http://forums.watchuseek.com/f39/breitling-pluton-academy-intruder-range-brief-history-98.html

Hope this helps.

_________________

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Do you know how the numbering on the chapter ring works? I think it has something to do with instrument and visual flight rules - allowed altitudes for flying. But here, they are on a dive watch. Curious.

Merged with your other thread, please don't double post. Sharkmouth has already answered your question above.