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Garmin Montana 650T.....Never leave home without it !!
On another note we used navionics to put us on the spot but with little to no service it eats up battery life on the phone. I kept my phone in airplane mode until we were using it to preserve battery life. The gps does not work in airplane mode though so you have to switch back and forth a lot.
...For duel use ONXMAPS (formly know as Hunting GPS Map) offer a land ownership map that has the "same" bathymetric (contour) map I used to make for the kml-Google Earth, except that they did do some manipulation to the line to match their water body. Not cheap but you get best of both world-land and water! ...
TL: Is that available via cell phone app toggle?
Diehard, that was a slug of good info. I'm overloading the grey matter trying to absorb........... but I'm learning!!
@ spear1Hey spear.....I haven't added anything extra to mine yet, so I don't have lake maps. I basically use mine for keeping track of my hot spots on the hardwater, a.k.a marking waypoints. Very easy to do & very accurate. As far as getting lake maps for the unit, I would check the Garmin website or call them. You can also get free maps at gpsfiledepot.com, which I believe requires installing Garmin Basecamp on your computer to upload the maps to your unit. Another website to check is onxmaps.com, a company based in Missoula. They make maps for Garmin devices that you can download to computer then upload to device or SD/Micro SD cards with the maps. I just looked at their website & it still says, "Coming Soon Maps For Fishing". Sorry so winded, just a bit of info for ya !!
With the "Overlay" image process that Diehard mention you can do the same with the Google Earth-Bathymetric. Save the image with the contour and re-overlay it back onto Google Earth, then save as kmz file. From pass experience, it does take time to get it perfectly overlay and if you're as anal as myself, accuracy is a premium. But all software/program are free, so all that is require is "time."