Jeff Robbins, Vesper Marine
wrote back quickly,
Thanks for your email
and questions. Yes, it will do as you've suggested and you can use either WiFi
or USB to the computer. All our transponders have USB and XB-8000 & Vision also have WiFi
. However, it does need a NMEA
input rather than SeaTalk
, so you'll need to convert that via either existing plotter or Raymarine
multi instrument or ST converter.
Very good question on GPS
reference location. Currently CPA/TCPA is calculated using GPS antenna
positions and doesn't take into account antenna
position data. Thus is done for several reasons, but the most significant is the antenna location is not known until vessel static data is received which can be up to 6 mins. Also not all vessels transmit heading so orientation isn't reliable unless that data is included. For most ships it is, but most other Class B transponders don't send it or there is no heading source on-board. In fact, as far as I know Vesper transponders are the only Class B's that do send heading when there is s NMEA 2000 compass or A/P present.
Regarding alarms... this is a function of displays, so it will depend on the capabilities of the display. Ours have a lot of control over alarm
scenarios with also the ability to eliminate alarms for stationary targets (eg you are pointed at an anchored or moored vessel) as you go past. All other displays will trigger an alarm
in that case.
Hope that info is helpful. If you have additional questions, let me know.
On Thursday, October 9, 2014 wrote:
name: Rick Gleason
I was unaware your products acted as a multiplexer for Nmea
. Very good!
I have Raymarine Seatalk
Instruments would I need a special seatalk converter to Nmea ---> Vesper Equipment
---> USB Computer Port?
Would the wifi version connect via wifi to PC?
Regarding your calcs for close proximity, say less than 1 nm what do you do? What if Target GPS antenna is not placed properly relative to ship? Do you adjust for width of ship too? Or is it simply GPS-GPS? What is conservative enough in close conditions, but not so conservative that alarms are always going?
What is your users experience about close proximity?
Thanks very much.