Join Date: Jul 2007
Location: Westchester, NY
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Re: What kinda mounted GPS unit should I buy?
Few points about "sailing date/information".
You'll need local info such as depth, wind speed and wind angle. These are transducers and are usually hard wired to a instrument which displays the data. The data can be "repeated" to multi function displays in multiple formats.
Chart plotters receive GPS signals and show the vessel's position on a digital chart.
MFD/chartplotters are chartplotters which display additional data: local environment (from transducers), RADAR from a separate radar "transceiver/antenna", AIS data from an AIS receiver. They can display weather data such as Sirius. Various screens can be selected with multiple layers of data. Some MFDs do wifi so data can be viewed on mobile devices. MFD do all manner of navigation computations.. DTW, TTG, SOG, COG, TWS and so on. And where your mother in law is.
Mobile devices are portable chart plotters. They may receive additional data from a wifi enabled MFD,
What data do you "need" to inform your sailing? Depends. You can use tell tales and flags to tell you about the wind, for example... a lead line for depth and so on.
Speed data can inform sail trim... if it is accurate and precision is .1 kts or better .01 kts.
pay attention... someone's life depends on it