| | Technical Tips and links The following page contains links to site contain material of relevance that the categories listed. Links to online calculators and conversion pages as well as downloadable calculators are also listed. Weather / Meteorological True and apparent wind calculatorTrue wind is the felt wind as if you were not moving. Apparent wind is the wind felt while moving.Source: US Sailing 
Beaufort Scale Beaufort | Avg mph | Avg kph | Knots | Surroundings | 0 (calm) | 0 | 0 | 0-1 | Smoke rises vertically and the sea is glassy or mirror smooth | 1 (light air) | 1.2-3 | 2-5 | 1-3 | Smoke moves slightly with breeze and indicates the direction of wind | 2 (light breeze) | 3.7-7.5 | 6-12 | 4-6 | You can feel wind on your face and hear the gentle movement of leaves on trees and shrubs | 3 (gentle breeze) | 8-12.5 | 13-20 | 7-10 | Smoke will move horizontally and small branches start to sway. Wind extends a light flag | 4 (moderate breeze) | 13-18.6 | 21-30 | 11-16 | Loose dust or sand on the ground will move and larger branches will sway, loose paper blows around, and fairly frequent whitecaps occur | 5 (fresh breeze) | 19.3-25 | 31-40 | 17-21 | Surface waves form on water and small trees sway | 6 (strong breeze) | 25.5-31 | 41-50 | 22-27 | Trees begin to bend with the force of the wind and causes whistling in telephone wires and some spray on the sea surface | 7 (moderate gale) | 32-38 | 51-61 | 28-33 | Large trees sway | 8 (fresh gale) | 39-46 | 62-74 | 34-40 | Twigs break from trees, and long streaks of foam appear on the ocean | 9 (strong gale) | 47-55 | 75-89 | 41-47 | Branches break from trees | 10 (whole gale) | 56-64 | 90-103 | 48-55 | Trees are uprooted, and the sea takes on a foamy white appearance | 11 (storm) | 65-74 | 104-119 | 56-63 | Widespread damage | 12 (hurricane) | 75+ | 120+ | 64 + | Structural damage on land and intense storm waves at sea |
Penman Monteith Calculation for Evapotranspiration ETo reference evapotranspiration [mm day],
Rn net radiation at the crop surface [MJ m-2 day],
G soil heat flux density [MJ m-2 day-1],
T mean daily air temperature at 2 m height [○C],
u2 wind speed at 2 m height [m/s],
es saturation vapour pressure [kPa],
ea actual vapour pressure [kPa],
es - ea saturation vapour pressure deficit [kPa],
D slope vapour pressure curve [kPa ○C],
g psychrometric constant [kPa ○C]. Troubleshooting and technical help 
CANgate The hardest step is finding data lines that are known CAN lines. Once a pair of lines are found, determine whether they are network lines. ► Using a DVM (Digital Voltage Meter), measure the voltage between each data line and ground. There should be a data line with a voltage slightly higher then the other. For example CAN high- 2.3VDC, CAN low- 2.1VDC. If voltages similar are found on your data lines then network data lines have been found (not necessarily CAN network data lines) ► Connect the data line with the higher voltage to the CANgate CAN 1 or CAN 2 high and the data line with the lower voltage to CAN 1 or CAN 2 low. ► Connect the +ve supply line (vehicle battery +ve supply etc) to the CANgate supply terminal and the -ve supply (vehicle battery -ve supply/ground etc) to the CANgate -ve terminal. ► Once these lines ae connected, plug the terminal entry serial connector to the CAN 1/CAN 2/GPS connection side. The red 'Power' LED should now be lit. ► Set up the CANgate in delogger or other software as per the user guide. If data is being recognised by the CANgate interface the blue CAN 1 Rx or CAN 2 Rx lights should flash madly. |
