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This distance is expressed in meters and nautical miles, according devices.

The Cross Track Error (XTE) represents the distance the boat is off the line linking the starting point (mark or previous waypoint) and the point of arrival (mark to join or active waypoint), perpendicular to this line. XTE (Cross Track Error) and TAE (Track Angle error)

The current direction and velocity ( ¹) have a significant impact on the VMC as, whatever the VMG, the course will, according to its direction, separate or bring the boat closer to the mark to join, and according to its speed increase or decrease the VMC.

Upwind it will be negative for VMG as it will increase the upwind angle, it may instead be positive at some angles downwind as it may decrease the downwind angle.

The drift ( ¹) due to wind will have a different impact depending on whether one steers upwind or downwind.

VMG and VMC will be equal if the mark to join upwind (or downwind) is in the axis of the true wind, which is rarely strictly the case.

The VMC regarding the boat moving over ground This applies both to upwind and downwind (especially for multihulls). VMG Max is achieved by the best compromise between these two options, called OTA (Optimum Tack Angle) is the optimum leg angle. If too close to the wind, the speed decreases and drift increases, if bear away, drift decreases, speed increases, but the route get longer.

Vmg reader for mac pdf#

It also lets you easily print WPD, WPS, XPS, VISIO, PDF files and save it to PDF format on Mac.

Vmg reader for mac for mac#

This is the "helpful speed", or the "gain in the wind". Cisdem Document Reader for Mac enables you to read WPD, WPS, XPS, VISIO, DjVu, Winmail, PDF files on Mac with a fantastic reading experience. The VMG is the best speed upwind, with the best angle between the course through water and the true wind. Two data that are generally the delight of boater's forums, have a look. It's quick to get lost…īut it is sometimes complicated until migraine headache with a well known acronym by sailors : VMG, and another less well known : VMC. While some of these acronyms are relatively well assimilated by the boater, as SOG for Speed Over Ground (SOG), you can quickly access subtleties that are not always mastered as COG for Course Over Ground, meaning "route runned on the ground", that the word "Course" in English can mean "Route" or "Heading" according to the context.ĬOG is the angle between the course of the ship relative to Geographic North (or True North), not to be confused with HDG Heading (compass heading) which can be either a Magnetic Heading HDM, angle counted relative to the Magnetic North, or HDT for Heading True, angle counted relative to Geographic North. This facilitates on-screen display taking few space. These acronyms, in the form of three letters most often, are the contraction of terms defining specific navigation data and according functions. This coded and cryptic language was originally developed for electronic navigation instruments, GPS mapping and other chartplotters.

Vmg reader for mac full#

Navigation applications are full of acronyms.