Andrew wrote:
Lunar is 35    ie   sidereal * 1.035

Actually, lunar is -slower- that sidereal, so that should've said
Lunar is -35    ie   sidereal * 0.965
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and Guide Rate is -not- (casually) settable in the 497
My (admittedly faulty) wetware memory says that it's 67% of sidereal.

Occasionaly i have my patch kits include an option for setting the rate
to some fixed number -other- that 67% (the last person who wanted that
wanted 10% of sidereal)

have fun
--***