Hi there folks,
You will be talking to your GPS for a long time if you want it to send a signal with your position on it.
They are Satelite Receivers not Tranceivers.
Your vhf Gmdss radio sends a gps position to another vhf tranceiver worked out from your gps position received from a satelite.Maybe coast guard run it through there radar to give them imfo,only for those running Gmdss sets that are linked to Gps.
Whether this other vessel position imfo/track can be linked to show a position on your radar is something I dont know.I would think it can.It will only show when he is transmitting,so will be intermitent,I presume his imfo/track will be Based on you transmitting at the time.
This new Transponder will show on radar providing you have power,and will be a extra cost as it will be an extra unit working independantly from existing kit and it will transmit all the time and bye the sounds of it update constantly your current possition to othere vessels, whilst it has power I presume and send the constant signal out on a designated frequencie.
If it uses Very high Frequencie radio waves and they are the same frequencies as a vhf channel, then maybe your existing kit may recieve the imfo/track and plot it on your radar screen.
I suppose with it being a continues transmitter it will give a continues possition and heading,speed,track etc.