Caladh
Well-Known Member
Paul - I have an Emtrak AIS per your recommendation which has proved v.g (!) Can the Axiom use its external GPS ? The network option on the Axiom shows the Emtrak as a device but not the Emtrak GPS.
Losing GPS - Problem solved
- Thread starter Seven Spades
- Start date
RunAgroundHard
Well-Known Member
Same set up as me. I think you can ask Axiom+ to use Emtrak as source for GPS, if you wish, there is a menu option for what source the plotter uses, internal, external, VHF, whatever is listed and I think I remember Emtrak being listed (but could be wrong). I choose to only use the Axiom internal. AIS will always use its own GPS, so Emtrak can't use Axiom GPS as an input. That's how I understand it, but happy to be corrected.
Sausalitoman
New Member
I will try two experiments. 1) Remove the AIS500 from the system by powering it down. 2) Try telling the Axiom+ to use the AIS500. My memory is that this did not work, but that was some time ago.
Perhaps that will give some insights.
Perhaps that will give some insights.
noelex
Well-Known Member
It is good to see that you are not tolerating a poor GPS signal or hardware.
It is surprising how many yachts put up with poor GPS performance. The GPS is an important instrument. It deserves reasonable equipment and a clear view of the sky to achieve good results. This is typically not expensive, or difficult to attain.
Hi performance options are worth considering for this mainstay of navigation if you have a large budget.
It is surprising how many yachts put up with poor GPS performance. The GPS is an important instrument. It deserves reasonable equipment and a clear view of the sky to achieve good results. This is typically not expensive, or difficult to attain.
Hi performance options are worth considering for this mainstay of navigation if you have a large budget.
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Caladh
Well-Known Member
Emtrak GPS is not seen in Network/GPS options even though connected on Seatalkng
PaulRainbow
Well-Known Member
Should work as post #25 if connected to the network. Does need GPS out enabled in the Emtrak ProAIS 2 software though.
ProDave
Well-Known Member
This thread highlights how much GPS receivers have improved. I have just bought one for £11 including postage from Aliexpress, it arrived from China in just 1 week from order. It acquires a GPS fix within just a few seconds of power up from cold. and works well indoors inside my house even.
I somehow get the impression a lot of quite expensive marine GPS receivers are still using old chipsets that are not as sensitive and nowhere near as fast.
I somehow get the impression a lot of quite expensive marine GPS receivers are still using old chipsets that are not as sensitive and nowhere near as fast.
KompetentKrew
Well-Known Member
Yeah, back in the late 90's I had an expensive black and white handheld Garmin - it was £260 and had the "12-channel receiver" and it still sometimes took 20 minutes to acquire its position. The reported accuracy could be very low.
A few years ago (maybe 2017? maybe before) I bought a cheap USB GPS from eBay and it had acquired my position before I'd even opened the map app. It was accurate to within a couple of metres even though I was sitting inside.
I'm very surprised by these reports of slow acquisition by reasonably modern chart plotters, as they should have access to the same chips.
Caladh
Well-Known Member
Thanks Paul.
Buck Turgidson
Well-Known Member
The toy drone market has driven micro electronics including GPS and micro IRS systems to incredible levels over the last few years. Adoption of the chip sets into other uses is slow and the mark up is eye-watering
out of date marine hardware
More capable drone chipset
out of date marine hardware
More capable drone chipset
Sausalitoman
New Member
I disconnected the AIS500 from the network, it had no effect on the problem. It still took 7+ minutes to get a fix. Once it got the fix, it would drop it repeatedly for a millisecond before reacquiring. It does this for another 5+ minutes and then everything seems to steady out and work. I have to believe the problem is in the internal GPS unit. I either need to get it repaired or find a Raystar 150 to feed to it.
My AIS500 behaves somewhat similarly in that it drops out on powerup repeatedly before stabilizing. I'll have to tinker with it more.
My AIS500 behaves somewhat similarly in that it drops out on powerup repeatedly before stabilizing. I'll have to tinker with it more.
Sausalitoman
New Member
I hope this helps some future Axiom/AIS500 user. I now know why I can't ever see the AIS500 as a GPS source on my Axiom (despite many hours of experimentation).
From Raymarine technical expert: The GPS of the AIS transceiver cannot be recognized by the system as a GPS source, it is reserved for AIS.
I have since reinstalled the Axiom software and I'm using just the SeatalkNG output from the AIS500 to go to the Axiom. I did get a fix after 3 minutes, so *maybe* I have improved things. Only future tests will determine if I've made any progress or need to go to a separate external GPS unit.
From Raymarine technical expert: The GPS of the AIS transceiver cannot be recognized by the system as a GPS source, it is reserved for AIS.
I have since reinstalled the Axiom software and I'm using just the SeatalkNG output from the AIS500 to go to the Axiom. I did get a fix after 3 minutes, so *maybe* I have improved things. Only future tests will determine if I've made any progress or need to go to a separate external GPS unit.
Sausalitoman
New Member
Now that my AIS500 only talks to my Axiom using SeatalkNG, I am getting a good fix in 3min and I didn't even get fix loss alerts this time, so I think this is the way forwards.
