Radar

[PaulRainbow]

Thanks so much you two.
That kit looks so much more compatible. Looks like power supply into the white, yellow into the back of the ST4000+. I assume I will need another cable to connect the Element9 plotter into the other white socket?

Correct, but note comments above regarding power, do not connect the power cable if the converter gets power from the Seatalk device it's connected to.

Yes, you will need a STNG spur cable to connect the Axiom.

 

[KREW2]

Correct, but note comments above regarding power, do not connect the power cable if the converter gets power from the Seatalk device it's connected to.

Yes, you will need a STNG spur cable to connect the Axiom.

I think I'm getting there. The St4000+ has its own power supply. Will this in turn power up the converter via the ST1 three pin connector into the yellow socket.

 

[PaulRainbow]

I think I'm getting there. The St4000+ has its own power supply. Will this in turn power up the converter via the ST1 three pin connector into the yellow socket.

Should do, just connect it and see if the converter LED comes on. If not, connect the power cable.

 

[Martin_J]

This all sounds good connecting the original Seatalk1 to the new STNG (effectively NMEA 2000 but with different connectors), so you will get a lot of seatalk data (eg wind, depth and basic heading) to the new plotter and other data from the plotter back to seatalk...

But wasn't this thread about getting things like MARPA to work on the new radar.

MARPA needs good heading data, usually at 10Hz or faster.. I might be wrong, but doesn't seatalk only transmit heading data at 1Hz?

Isn't that a bit slow for good MARPA on a modern radar.

Would the NMEA0183 connection on the ST4000+ have faster heading data...?

 

[KREW2]

This all sounds good connecting the original Seatalk1 to the new STNG (effectively NMEA 2000 but with different connectors), so you will get a lot of seatalk data (eg wind, depth and basic heading) to the new plotter and other data from the plotter back to seatalk...

But wasn't this thread about getting things like MARPA to work on the new radar.

MARPA needs good heading data, usually at 10Hz or faster.. I might be wrong, but doesn't seatalk only transmit heading data at 1Hz?

Isn't that a bit slow for good MARPA on a modern radar.

Would the NMEA0183 connection on the ST4000+ have faster heading data...?

Not sure what you mean.
The heading data will be coming from the ST4000+ if i go down the ST1 STNG route.

 

[Goldie]

I know MARPA is a useful tool on the radar for CPA, but the AIS will cover that.

AIS will cover it BUT, only for traffic transmitting AIS; don’t assume all ‘big stuff’ does that. I give you military vessels, Border Force, many fishing boats etc. and that’s before you think about yachts and the MoBo coming the other way at 20kts in fog (and yes, I’ve seen that happen and he passed close enough for me to see that he didn’t have a radar scanner fitted….). If the OP can do it, then a modern radar, interfaced with AIS and providing MARPA is a VERY powerful tool.

 

[Martin_J]

Not sure what you mean.
The heading data will be coming from the ST4000+ if i go down the ST1 STNG route.

It will if that converter is used and will be coverting from the original Seatalk1 to SeatalkNG. The old seatalk however is a much slower protocol and unless I'm mistaken, isn't able to pass heading data at the frequency required to use MARPA or to reliably overlay radar onto the charts whilst in North up mode.

I know the thread below refers to a different autopilot computer, but the answer covered heading data on Seatalk1.

Seatalk1 to Seatalkng

 

[KREW2]

It will if that converter is used and will be coverting from the original Seatalk1 to SeatalkNG. The old seatalk however is a much slower protocol and unless I'm mistaken, isn't able to pass heading data at the frequency required to use MARPA or to reliably overlay radar onto the charts whilst in North up mode.

I know the thread below refers to a different autopilot computer, but the answer covered heading data on Seatalk1.

Seatalk1 to Seatalkng


View attachment 148558

Thanks, can you tell me what S1G is.
When the old system was working fine I used to get MARPA on it fine.

 

[PaulRainbow]

Thanks, can you tell me what S1G is.
When the old system was working fine I used to get MARPA on it fine.

S1G is an older model of AP, it's an S1 with Gyro