If i network the 959 with the 1198 could i hook up the puck to the 959 to share way points with the 1198 up front?
Yes a GPS antenna will share over Ethernet ...
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Your OP indicates interest in using the puck for slow speed heading direction ...
Is the external antenna the AS GPS HS antenna or the AS GR50 that ships with the 1198 ...??
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The 959 does have internal GPS ... why not connect the puck to the 1198 and let the 959 use its internal GPS antenna ... ??
Rickie