Radio Messages & Grid References

[malcymalc]

Two questions that are not related:

1) When running RuB and the Not Your Grandmothers U-Boat Campaign I sometimes receive orders / advice from Command that run to more than one page of text on the message pad - how do I read page 2 of the message?

2) Not an aspect of SHIII per se but reading combat reports I see references such as AF3344 - now AF33 I follow but how do the last two digits fit in? Presumably a subdivision of the full sector?

Thanks
Malcolm