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I use a heavy-duty retractor I picked up at Sportsman's warehouse. The hardware and spring is stainless steel and/or delran. They come in either a snap attachment or a velcro attachment. It holds it tight to my chest and is easy to pull forward to view either the SPG, compass or depth. The standard size is borderline strength if your console is heavy.
I use a piece of bike inner tube. It is easier to attach and adjusts. And maybe easier to remove when needed. Probably not as unbreakable as cave line so I would not use it on anything that would be lost if the attachment failed. I use cave line in those cases.