[Az-Geocaching] Garmin Mapource US TOPO question

[ShadowAce]

 Does anyone have this product?

 If so, could you let me know what the contour intervals are?  I was looking
online to possibly buy this for my new GPS and I see they are 1:100,000
maps, but I cannot find anything mentioning what the contour intervals are.

 The online map viewer seems to be set at something like 163 foot elevations
and I wondered if the maps were the same.

 Thanks in advance.

(yes, I tried to call, but they are closed for the day :))
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