smart phone GPS. Should be close enough.
Dunno what phone u have but on my iphone I found that if I turn the phone off, then back on and dont enter the sim password, the gps is a little more accurate-at least in terms of pinpointing a submerged brush pile in the lake. It'll get me within 15 foot or so, close enough to catch crappie. If I just use it normal without a reboot it will try to triangulate the closest cell tower locations and I can be sitting still and the little arrow on the GPS which points my location will move all over the place, usually 20 foot or so--and I am not moving. I use it often at the lake. The side benefit (for me) is that if I dont' enter a sim password, nobody can get in touch with me but that's ok since I'm usually busy.
I used to be a lot like that, had to be just the way I wanted it. I wanted my phone to get me RIGHT on top of that brush pile, and borrowed a Garmin to get me there, set the phone location, and told myself I'm fixing to spend about $900 on a new fish finder with the best possible GPS. Well I never did, and guess what? I catch fish just fine. Similar, used to put gauges of all kinds in my old vehicles. Altimeter, baro, ground speed, oil temp, oil pressure, water temp, trans temp & pressure (automatic), rear diff temp, fuel pressure, and fuel level. One day one of the gauges quit working on the way back from the coast. I never fixed it and I liked it, so I yanked the rest of them out, left the factory idiot light, mechanical speedo, and fuel level gauge intact and sold the rest of the stuff for what the entire truck was worth. Haven't looked back either. Lot less stuff to fiddle with and less stressing about whether or not my old $500 truck was going to run warm or run out of fuel or what. Just drive it now and if it breaks I'll go get another $500 truck, and leave that one where it broke.
