Steven P. McNicoll wrote:

Here's a link to an approach at Antigo, Wisconsin:

WOW! My home town! :-) However, I learned to fly at Cheyenne, WY.

http://www.myairplane.com/databases/...s/06215N16.PDF

Can GPS substitute for ADF on this approach? Please explain your answer.

No. The ADF is the Primary navaid. To use the GPS for this
approach, the approach would be relabeled, using "GPS" in the
header.

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Now, please review with me my home airport... KFNL
http://www.myairplane.com/databases/...s/05677I33.PDF

Note in the lower left of the central graphic box, where it says
"ADF REQUIRED". In this case the GPS may be substituted for the
NDB, as this is an ILS approach and the NDB is not the primary
navaid.

Best regards,

Jer/ "Flight instruction and mountain flying are my vocations!"
--
Jer/ (Slash) Eberhard, Mountain Flying Aviation, LTD, Ft Collins, CO
CELL 970 231-6325 EMAIL jeratfrii.com http://users.frii.com/jer/
C-206 N9513G, CFII Airplane&Glider FAA-DEN Aviation Safety Counselor
CAP-CO Mission&Aircraft CheckPilot BM218 HAM N0FZD 240 Young Eagles!