GPS position on DSC VHF

[Chris_d]

I've recently bought a new DSC vhf (Silva S10) and interfaced it to my GPS, all seems to work fine. However the positon shown on the VHF is a few minutes and seconds different to that shown on the GPS, this is standing still /forums/images/graemlins/confused.gif
My GPS is set to WGS84 true, but does it automaticaly send NMEA in another format regardless of the display setting or is there another reason for the difference? its not far out but I expected them to be exactly the same, anybody else noticed this?

 

[duncan]

are you sure they are both showing minutes and seconds?

 

[Chris_d]

Yep, I get say 1deg 10'43.45W on the GPS and 1deg 10'43.75W on the DSC, only about 5-10metres different, but odd?

 

[DavidGrieves]

I have Silva S15 and it is also out but not by much. Haven't really looked into why its out.

 

[duncan]

10.43.750 is exactly the same position as 10.43". 45'

?this is not a coincidence..............?

 

[Chris_d]

doh.. you might have it there, back to school /forums/images/graemlins/blush.gif I'll check again tonight.

 

[Ariadne]

If you look at your GPS & DSC/VHF manuals you'll find find a bit that tells you how to set it to 1,2 or 3 decimal places. It can easily be tuned out so to speak, then both sets will read the co-ordinates.

Well it can be on my Garmin/Icom set up.

 

[najsmith]

I'm wanting to hook my Garmain 128 to the ICOM 421 next weekend - is that the same rig as you?

Any advice?

 

[Birdseye]

Shouldnt worry - as I understand it, the DSC only sends your position to the nearest minute anyway. After that, the lifeboat have to look for you.