The higher sensitivity receivers such as on the Garmin 60CSx and newer GPSMAP 62 family do a pretty good job in canyons and under a canopy.

Point is though, take more than one form of navigation. Some work better than others, some more accurate, some more reliable, some need batteries, some are negatively effected by variations in the earth magnetic field.

It's good to be able to take a lat-long and transfer that point to a map. Is that where you think you are? My goal is to never need to activate my PLB. Although in certain circumstances I'll activate without a second thought . . . Darn, the ELT just sank.

Originally Posted By: unimogbert
I don't buy that BOTH GPS and compass can be off.
The compass INSIDE the GPS perhaps but not both forms.
I try to avoid using the GPS's electronic compass; it's a major power hog, power better saved for things a mag compass can't do.
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Better is the Enemy of Good Enough.
Okay, what’s your point??