Smart Tether GPS?

Discussion space for posts that don't fit into the other categories, such as issues with VideoRay products, or general ROV tips.

Smart Tether GPS?

Postby Stinger CC » Fri Oct 14, 2011 3:06 am

Is anyone else using another GPS than the standard that comes with the tether? How accurate is the GPS and is it possible to use another one?

And im also wondering how much tether you can extend the smart tether with? In the program in the options it says somthing like extend with 80 meters where you chose what ROV you got.
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Re: Smart Tether GPS?

Postby Chief » Sat Oct 15, 2011 9:29 pm

Stinger CC wrote:Is anyone else using another GPS than the standard that comes with the tether? How accurate is the GPS and is it possible to use another one?

And im also wondering how much tether you can extend the smart tether with? In the program in the options it says somthing like extend with 80 meters where you chose what ROV you got.


Stinger,

Are you asking if you can use a different GPS Antennae? As far as accuracy goes, it is generally 2% of your tether length, so 100 meters would give you a 2 meter accuracy.

The 80M is the Smart Tether Extension cable that has nodes in it. You can also use regular cable (just not PPT) with the system. I've used 500' of negative attached to a standard 40M Smart Tether to conduct some deep operations. The trick is to use a weight right after the cable connections and make sure the tether is going straight up and down.

Hope this helps and if you have any other questions, please feel free to ask or email me.

Chief
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Re: Smart Tether GPS?

Postby tom_glebas » Sat Nov 12, 2011 3:37 pm

Any GPS that outputs NMEA strings should be supported, so you can use a GPS antenna other than the one included with the Smart Tether.

If you are seeking more accuracy/precision, you can also use a differential GPS.

Craig is correct for the Pro 4, in which you can use a standard tether (typically negative). And this is generally for going deeper. It will work for horizontal extension of range too, but without additional nodes, it will have less accuracy. You can also buy a dedicated Smart Tether 80m extension that includes 2 nodes to maintain accuracy with extended horizontal range.

For the Pro 3, you have to buy a Smart Tether extension due to the larger connectors. It comes in a basic extension without nodes and one with two nodes like the Pro 4.

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