Silva compass index

[dougreynolds10]

Is something I'm missing here or is my compass index off. The numbers on the side of the index do not match the numbers on top. I bought it used but the indexing does not make sense to me. Does someone have a manuel for this compass also I have tried searching this topic but i found a dead link to the manuel.

 

[torrid]

The markings on the side are not degrees. It is scaled where 10=90 degrees. That way when tacking, you only have to add or subtract 10 instead of 90.

 

[dougreynolds10]

but the index on top doesn't match the side

 

[Wavedancer]

As torrid tried to explain, the marks on the side are not related to degrees. They are meant to make it easier to note shifts etc.

 

[dougreynolds10]

but the index on top doesn't match the side

 

[torrid]

but the index on top doesn't match the side

The numbers on the top are still in degrees so you can have a compass bearing if you need it (like if the race committee gives a heading to the windward mark).

 

[49208]

Before one more "top index doesn't match the side" reply, read/watch the following, hopefully it explains it...
http://www.roostersailing.com/articles/compass_article.htm

Honestly, finding those two references took exactly 5 seconds googling "Silva tactical compass"

 

[dougreynolds10]

my bad for the same reply twice my phone sent it twice

 

[torrid]

As a public service, I have scanned my old instructions into a .pdf file.

 

[Mrs. P]

Mr. P made me a compass for dummies guide, shift by shift. I didn't get until this ...

http://www.impropercourse.com/2012/09/shifts-lakes-and-compasses.html

 

[49208]

Mr. P made me a compass for dummies guide, shift by shift. I didn't get until this ...

http://www.impropercourse.com/2012/09/shifts-lakes-and-compasses.html

Think there might be one small typo in there...

"When I spent time with Frank Bethwaite, he taught me about how to measure the timing between these shifts, how this time would decrease when going upwind, and how they would decrease going downwind. "

Timing (time between shifts) should increase going downwind.

 

[Mrs. P]

Think there might be one small typo in there...

"When I spent time with Frank Bethwaite, he taught me about how to measure the timing between these shifts, how this time would decrease when going upwind, and how they would decrease going downwind. "

Timing (time between shifts) should increase going downwind.

Good catch! You're absolutely right. Thanks!

 

[dougreynolds10]

Thank you all for the great information. Most of it could not be found in 5 seconds on google... probable 30 seconds. Although I wouldn't trust it unless it came from you guys first.