Simple, old-school, and free. Works for me!
This is a simple app: basic nautical maps underneath a location-aware dot.
If you’re looking for basic depth and feature info, this works. The other reviewer mentioned that the maps are outdated — this might be true in places that the river has been shoved around by people or tides, but from Sauvie Island to The Dalles I haven’t seen any glaring issues.Outdated charts 1983
Poor charts outdated.