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SIMRAD IS42/AP44/NAC-3/... true wind is only calculated from STW + no distance log  

 

(@nibheis)
Active Member
Joined:2 weeks  ago
Posts: 3
15/05/2018 10:18 am  

Hi all - this is my first post on this forum,

I upgraded our 10 years old SIMRAD electronics to the latest instruments (IS42, AP44, NAC-3) - no MFD (we use computers, tablets and phones using a VesperMarine XB-8000's NMEA gateway functionnality over wifi).

After the upgrade, which we are really happy with, I noticed 2 weak points:

- There are no sources on our NMEA2000 available to store the distance log (previously, the AC42 autopilot calculator did that. NAC3 does not handle PGN128275).) Do you guys see any hope in there? I feel sad about upgrading the electronics and losing such basic functionnality.

- True wind is calculated only from STW. When the small paddlewheel is fouled... I get no STW, so no real TWA/TWS. In wind mode, the autopilot normally follows TW when going downwind... I can not find any setting to change TW calculation from STW to SOG on IS42/AP44/NAC3. Any help welcome!

Looking forward to reading from you 🙂

Best regards

Edited: 2 weeks  ago

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Ben Stein
(@ben-stein)
Member Admin
Joined:3 months  ago
Posts: 26
15/05/2018 10:37 am  

Hello,

I took at look at the AP44 manual ( https://ww2.simrad-yachting.com/Root/Simrad-Documents/AP44_docs/AP44_OM_EN_988-11189-002_w.pdf) and it looks like trip logs should be able to accomplish the distance logging you're hoping to retain.  Have you checked those out?  Is there a problem with the way they're implemented?  

As far as speed I'm not sure the process of changing the source but the manual indicates the autopilot will move from using STW to SOG if STW is unavailable. 

Use SOG as boat speed
If boat speed is not available from a paddle wheel sensor, it is
possible to use speed over ground from a GPS. SOG will be
displayed as boat speed and used in the true wind calculations and
the speed log.

I have a feeling the issue is that switch may only happen when the STW paddle-wheel sensor leaves the network.  I also suspect you're probably using a paddle wheel that is also providing water temp and possibly depth info such that you wouldn't want to disconnect it.  Given the manual's clear mention of the capability to switch from STW to SOG it may be worth an inquiry to Simrad.

Good luck!

Ben

Contributing Editor, Panbo.com


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(@nibheis)
Active Member
Joined:2 weeks  ago
Posts: 3
18/05/2018 10:18 am  

Hi Ben,

Thanks for your reply. I got a "similar" reply from SIMRAD support (only similar because they gave me a wrong path to this setting). Here is the right path:

Settings>Calibration>Boat Speed>Use SOG as boat speed

Unfortunately, I fear this will apply to all calculations (true wind, tide, autopilot rudder response, etc.). While this is a nice back-up solution for when the paddlewheel is fouled, that is not exactly what I wanted.

Still no reply from SIMRAD concerning the distance log. I have the 2 trip logs working (they both accumulate time and distance) but the distance log does not move. When I check the network configuration, in the source list there is a 'distance log' entry, when I enter there, I can only see 'no devices available' for this (even after updated the sources).

When I compare AC42 and NAC3 manuals, I do see that PNG 128275 is no longer handled on NAC3 (arrrg). We have quite a long list of instruments on board and none can do distance log??

SIMRADAP44
SIMRADAP44
SIMRADIS42
SIMRADIS42
SIMRADIS42
SIMRADIS42
VesperMarineXB8000
NAVICONAC-3
B&G608 Wind Sensor
SIMRADRC42
NAVICONSPL-400
AIRMARDST800
SIMRADRF25
NAVICOBT-01
NAVICOWR10

I can set a distance log value manually (it does not move when sailing) but it does not disappear between reboots... so it is stored somewhere for sure. Maybe it is a bug?


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(@nibheis)
Active Member
Joined:2 weeks  ago
Posts: 3
18/05/2018 10:18 am  

Hi Ben,

Thanks for your reply. I got a "similar" reply from SIMRAD support (only similar because they gave me a wrong path to this setting). Here is the right path:

Settings>Calibration>Boat Speed>Use SOG as boat speed

Unfortunately, I fear this will apply to all calculations (true wind, tide, autopilot rudder response, etc.). While this is a nice back-up solution for when the paddlewheel is fouled, that is not exactly what I wanted.

Still no reply from SIMRAD concerning the distance log. I have the 2 trip logs working (they both accumulate time and distance) but the distance log does not move. When I check the network configuration, in the source list there is a 'distance log' entry, when I enter there, I can only see 'no devices available' for this (even after updated the sources).

When I compare AC42 and NAC3 manuals, I do see that PNG 128275 is no longer handled on NAC3 (arrrg). We have quite a long list of instruments on board and none can do distance log??

SIMRADAP44
SIMRADAP44
SIMRADIS42
SIMRADIS42
SIMRADIS42
SIMRADIS42
VesperMarineXB8000
NAVICONAC-3
B&G608 Wind Sensor
SIMRADRC42
NAVICONSPL-400
AIRMARDST800
SIMRADRF25
NAVICOBT-01
NAVICOWR10

 

I can set a distance log value manually (it does not move when sailing) but it does not disappear between reboots... so it is stored somewhere for sure. Maybe it is a bug?

 

Best regards,

nibheis

Edited: 1 week  ago

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