NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Pilot charts
From: Andrés Ruiz
Date: 2008 Apr 16, 08:11 +0200
From: Andrés Ruiz
Date: 2008 Apr 16, 08:11 +0200
Dear Gary, Such strong currents no exist. 30 is not the speed, is the percentage of occurrence in current direction. Reading Current Roses: Like the wind rose, the current rose graphically, (attached pic), depicts numerous current characteristics such as percentage occurrence of current in eight compass directions, and speed in knots of the current. The length of the 8 lines radiating out from the circle indicates the percent occurrence of current FLOWING TOWARDS each compass direction. The longer the line the higher the occurrence in that direction. If the length of the line exceeds the area available to display it (approximately 30 percent), the actual percentage is displayed. The number of feathers on the line indicates the speed in knots of the current in that direction with each feather representing 0.2 knots. -----Mensaje original----- De: NavList@fer3.com [mailto:NavList@fer3.com] En nombre de Gary J. LaPook Enviado el: miércoles, 16 de abril de 2008 1:43 Para: NavList@fer3.com Asunto: [NavList 4842] Re: Pilot charts glapook@pacbell.net wrote: I have attached a portion of the January Pilot Chart of the South Pacific Ocean published by the Defense Mapping Agency. Until I looked at this chart I had no idea that currents in the South Pacific could be so strong. The green arrows show the current direction and speed in knots. For example, the current shown passing the southern end of New Zealand is 10 to 20 knots! And in the Gilberts it shows up to 30 knots! How do ships manage to maneuver against such strong currents? gl --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---