I bought a Lenovo Tab P10 for the 5yr old for Christmas last year. I loaded up Navionics one night, and used it on the boat. No overheating issues, even in direct sun for the day. I think it was like $160 or something. Has lots of Mil spec dust and vibration certifications as well.
If I was buying new today; that Lenovo tablet and a RAM mount with a tablet sized "X-Grip" holder would be my go to solution.
I'm not finding anything around that price, Amazon has it showing $330. Was that a Costco/Sam's Club buy?
I'm looking to retire my existing tablet to Kindle use instead of buying a Kindle, and upgrading the tablet, both for speed and moving to USB-C to not require multiple types of charging cables.
The Navionics & a tablet sound great but I still want a depth finder onboard so I’d have to add something to get live depth readings.
I'm not trying to badger you or belabor the point, only trying to address points made. If you don't fish, and you know the draft of your boat (across all Yamaha's, it's been 18"), it's been reported over many on here that 3' is sufficient to set the alarm levels on their boat, and Navionics has warnings as well, not to mention that they've got highly accurate depth charts to keep me out of trouble.
Live depth is useful to know that something is there, but seems like it's often going to register too late to be useful. For instance, when I grounded my boat on a rock pile that was "installed" by some jackasses over the winter, the working depth finder on my boat still had me registering as being fine in 3' of water, while the front portion of my boat was grounded and not moving. No working depth finder exists that would have saved me, only my slow speed helped allow me to get in the water and float it backwards and off the pile with some effort. Had I been going at speed, it's possible I'd have never gotten hung up at all, but a depth finder would have only registered after the fact, if I had gotten hung up.
My situation is similar to yours; I spend 70% of my time on one lake and the river, with the other 30% not nearly as well known, but I've trusted and followed Navionics for several years with zero issues that could have been prevented. The other thing, and this can be verified around the forum, is that the term "working depth finder" is something that Yamaha has issues with nailing down. OFTEN the OEM unit craps out, where the GPS feed for my tablet hasn't thus far. The mouth of my creek leading out to the lake is anywhere between 3 feet to a foot and a half, depending on recent rainfall, and the OEM often craps out right after getting onto the lake. I trust Navionics more than the OEM depth finder, and if I'm ever in doubt, I've got an oar for sounding.
If you've got a gauge for depth, it could be removed and updated with something like this for your needs:
https://www.amazon.com/dp/B000JEOEE...g=UTF8&linkCode=ml1&tag=seamancustomb-20&th=1
If you've the space for that gauge on the panel, it's a relatively easy task to drill the hole and install, or it could be installed in an auxillary holder and placed somewhere at the helm.
Anyway, whatever your preferences, here's hoping you find something that doesn't beat your wallet senseless.