will the 339 communicate with ur vhf? just curious, i have the 337 and love it. especialy with the navionics gold card. just put the pointer over the bouy and get water level, water speed,water direction, water temp, salinity, wind speed, wave hieght,etc... all real time. and when i get a new motor it will display all engine data. rpm, tilt angle, etc... and i dont know bout the v20 yet but, on my bayliner she read the bottom at wot (58.6 mph). just an awsome machine for the money.