With v2.07 (current) software; the tides and currents issue doesn't kick in unless you leave them turned "On" for many hours without ever turning them "Off". Somewhere about the 10 to 12 hour point you could have problems. It isn't a big issue as was in previous versions, and it only applies to the MFD8 and MFD12. The MFDBB no longer has this issue. With that said; the next version of NN3D software does address this and should be released "soon". When I say “soon”, I would guess within the next 60 to 90 days. v2.07 software is really good, and from what little I know about the next version; there won't be any huge changes. Keep in mind when you turn on the tides and/or currents function, you just turned on a ton of real time calculations at the processor. It is best to turn the feature(s) off when not being used.