Connecting a gps receiver to a Nasa Clipper GPS Repeater

[pvb]

I wonder why the OP chose a Topgnss receiver? Others would seem a lot easier to use.

 

[Thors]

I wonder why the OP chose a Topgnss receiver? Others would seem a lot easier to use.

I'm beginning to think you're right! Any suggestions as to what would be simpler. The Topgnss receiver antenna I have does not have a manual, which leaves any purchaser completely in the dark.

 

[Thors]

Usually using some sort of terminal software and sending a command.

Did you see my post about using the NASA Repeater in the way you plan?

Yes, thank you. Researching plotter options now and about to sling the topics receiver I have in the bin. I have learnt my lesson in buying a very undocumented product on the cheap.

 

[[163233]]

Which nmea sentences?

I don't know off the top of my head, what I meant was that it requires the GPS to be putting it out. That is, it's not the NASA gadget that requires the waypoint but the GPS unit.

 

[prv]

I don't know off the top of my head, what I meant was that it requires the GPS to be putting it out. That is, it's not the NASA gadget that requires the waypoint but the GPS unit.

That would make sense. It’s assuming you’re navigating with something like a Garmin 128 at the chart table, and just want to show some of the key numbers in the cockpit. A rather old fashioned way of doing things, and not terribly useful connected only to a headless GPS receiver.

Pete

 

[GHA]

It just repeats what it gets over nmea, so if the nmea input is providing SOG and COG it'll display it.

Just had a play, from output from opencpn the nasa gps repeater needs RMB & RMC nmea messages to display anything. So looks like no waypoint activated on the gps receiver then no RMB sentence - nothing gets displayed.
Just RMC providing position, SOG & COG isn't enough.

 

[pvb]

Just had a play, from output from opencpn the nasa gps repeater needs RMB & RMC nmea messages to display anything. So looks like no waypoint activated on the gps receiver then no RMB sentence - nothing gets displayed.
Just RMC providing position, SOG & COG isn't enough.

That could save the OP a lot of wasted time!

 

[MikeCC]

There is certainly not much out there now in the way of basic GPS navigators like the Garmin 158 and its predecessors unless you want to pay silly money for a Furuno. There are handhelds like Garmin GPS73 which can be powered from 12V.

 

[MikeCC]

That could save the OP a lot of wasted time!

Think that's what I was trying to point out back in post 7!

 

[[163233]]

That would make sense. It’s assuming you’re navigating with something like a Garmin 128 at the chart table, and just want to show some of the key numbers in the cockpit. A rather old fashioned way of doing things, and not terribly useful connected only to a headless GPS receiver.

Pete

Yes, I had a Garmin 152 and that didn't need a way point set to put out the basic info.

Perhaps opencpn could use a tweak?

 

[GHA]

Perhaps opencpn could use a tweak?

In what way? Opencpn echoes nmea coming in , if you have no filters set, and adds RMB if there is an active waypoint. The nasa repeater needs RMB to display data.
Which seems as it should be in Opencpn, what tweak does it need?

 

[[163233]]

In what way? Opencpn echoes nmea coming in , if you have no filters set, and adds RMB if there is an active waypoint. The nasa repeater needs RMB to display data.
Which seems as it should be in Opencpn, what tweak does it need?

Ah I see, I misunderstood your OpenCPN comment. I thought you meant that if you created a waypoint in that then it worked.

 

[GHA]

Ah I see, I misunderstood your OpenCPN comment. I thought you meant that if you created a waypoint in that then it worked.

Well yes, you need an active waypoint to get RMB data, in opencpn or a receiver..... The nasa won't work otherwise, with just RMC being received even though RMC has lat,long,sog,cog. RMC on it's own doesn't get displayed on the nasa.
Seems a bit of a limitation...

 

[[163233]]

Well yes, you need an active waypoint to get RMB data, in opencpn or a receiver..... The nasa won't work otherwise, with just RMC being received even though RMC has lat,long,sog,cog. RMC on it's own doesn't get displayed on the nasa.
Seems a bit of a limitation...

This is what I don't understand, because I almost never set a waypoint but I had COG and SOG out of the repeater.
The Garmin 152 must put them out all the time, maybe it has a default waypoint that it works from.

 

[prv]

This is what I don't understand, because I almost never set a waypoint but I had COG and SOG out of the repeater.
The Garmin 152 must put them out all the time, maybe it has a default waypoint that it works from.

RMB doesn't have COG and SOG fields, so the presence or absence of that sentence shouldn't have any bearing on whether they were displayed.

You're saying the NASA doesn't display data from other sentences if RMB is missing? That seems like a very odd decision, more likely a bug.

Pete

 

[GHA]

This is what I don't understand, because I almost never set a waypoint but I had COG and SOG out of the repeater.
The Garmin 152 must put them out all the time, maybe it has a default waypoint that it works from.

Might be a different firmware version of the nasa repeater then. RMB is active waypoint data. Without RMB the one I have onboard displays nothing, it needs both RMB & RMC to display..