[Paddlewise] Waterproof(?) electronics

I've had an Icom M88 radio (JPX7) for over a 
year; I have it attached to my PDF strap and have 
rolled with it, crashed through surf with it and 
rinsed it off with a hose after salt water use 
--- it has worked flawlessly and reliably.

I've had a Garmin GPS 72 (IPX7) since June.  The 
first one started showing condensation after one 
trip (no immersion, just drips from the paddle 
shaft) and failed after 3 days of paddling in 
coastal NC where I always tucked it away in the 
day hatch for surf entries/exits & rolling 
practice.  After getting a new (or refurbed) unit 
from Garmin, the second unit failed on the first 
trip when it was on deck during an unexpected 
roll (Dismal River, NE).  This time, there is 
water visible under the display.  So, it is now 
going back to Garmin again (the customer support 
rep said that "he had never heard of this happen 
to one of their marine portable units, really").

Have I just gotten two lemons, or are Garmin's 
IPX7 gps units really not on par with Icom's 
JPX-7 radios? (I'm assuming that IPX7 & JPX7 are 
basically the same --- is this not true?)

Here are the various ratings for reference:
IPX0   Non-protected.
IPX1   Vertically falling drops shall have no harmful effects.
IPX2   Vertically falling drops shall have no 
harmful effects when the enclosure is tilted at 
any angle up to 150 on either side of the 
vertical.
IPX3   Water sprayed at an angle up to 600 on 
either side of the vertical shall have no harmful 
effects.
IPX4   Water splashed against the enclosure from 
any direction shall have no harmful effects.
IPX5   Water projected in jets against the 
enclosure from any direction shall have no 
harmful effects.
IPX6   Water projected in powerful jets against 
the enclosure from any direction shall have no 
harmful effects.
IPX7   Ingress of water in quantities causing 
harmful effects shall be prevented when the 
enclosure is immersed in 1m of water for 30 
minutes.

If a device is IPX7, doesn't that mean that it 
also meets the IPX1-6 (particularly 4-6) 
standards?
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