Dave_G
New
A possible solution would be to use NavDive on Kickstarter which is an underwater GPS unit. My friend Kelly is actually running the campaign and he came up with the device because he needed it for some archaeology work he was doing.
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I am going to place a few around Ontario as I am diving around Ontario this year.
I will have to keep an eye for these.
I am hoping to be diving some around ontario, but iam pretty new still, so make them novice freindly LOL